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Dell Inspiron Chromebook 7486 Service Manual

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Inspiron Chromebook 7486
Service Manual
Computer Model: Inspiron Chromebook 7486
Regulatory Model: P94G
Regulatory Type: P94G001

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Summary of Contents for Dell Inspiron Chromebook 7486

  • Page 1 Inspiron Chromebook 7486 Service Manual Computer Model: Inspiron Chromebook 7486 Regulatory Model: P94G Regulatory Type: P94G001...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2018 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

  • Page 3: Table Of Contents

    Contents 1 Before working inside your computer......................7 Before you begin ................................7 2 After working inside your computer....................... 8 3 Safety instructions............................9 Electrostatic discharge—ESD protection........................9 ESD field service kit ................................ 10 Components of an ESD field service kit........................10 ESD protection summary ............................10 Transporting sensitive components..........................
  • Page 4 Procedure..................................27 Post-requisites..................................27 14 Removing the I/O board..........................28 Prerequisites..................................28 Procedure..................................28 15 Replacing the I/O board..........................30 Procedure..................................30 Post-requisites.................................. 31 16 Removing the speakers..........................32 Prerequisites..................................32 Procedure..................................32 17 Replacing the speakers..........................33 Procedure..................................33 Post-requisites..................................33 18 Removing the wireless card........................34 Prerequisites..................................
  • Page 5 Procedure ..................................42 Post-requisites..................................42 26 Removing the camera..........................43 Prerequisites..................................43 Procedure..................................43 27 Replacing the camera..........................44 Procedure ..................................44 Post-requisites..................................44 28 Removing the display cable........................45 Prerequisites..................................45 Procedure..................................45 29 Replacing the display cable........................46 Procedure..................................46 Post-requisites..................................46 30 Removing the display panel........................47 Prerequisites..................................47 Procedure..................................47 31 Replacing the display panel........................
  • Page 6 37 Software..............................58 Operating system................................58 Chrome OS................................. 58 Verified Boot................................59 Disk Partition Map..............................60 Developer and Recovery mode..........................61 Coreboot and U-boot Custom Firmware......................... 61 Chrome vs Chromium OS............................62 View system information..............................62 38 Troubleshooting............................66 Basic troubleshooting..............................66 Power issues................................66 CROSH....................................70 CROSH commands................................

  • Page 7: Before Working Inside Your Computer

    Before working inside your computer NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Before you begin Save and close all open files and exit all open applications. Shut down your computer. Click Start > Power >...

  • Page 8: After Working Inside Your Computer

    After working inside your computer CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer. Replace all screws and ensure that no stray screws remain inside your computer. Connect any external devices, peripherals, or cables you removed before working on your computer. Replace any media cards, discs, or any other parts that you removed before working on your computer.

  • Page 9: Safety Instructions

    Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

  • Page 10: Esd Field Service Kit

    It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all insulator parts while performing service and that they use anti-static bags for transporting sensitive components.

  • Page 11: Transporting Sensitive Components

    Transporting sensitive components When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport. Lifting equipment Adhere to the following guidelines when lifting heavy weight equipment: CAUTION: Do not lift greater than 50 pounds.

  • Page 12: Recommended Tools

    Recommended tools The procedures in this document may require the following tools: • Philips screwdriver #1 • Flat-head screwdriver • Plastic scribe Recommended tools...

  • Page 13: Screw List

    Screw list NOTE: Screw color may vary with the configuration ordered. Table 1. Screw list Component Secured to Screw type Quantity Screw image Base cover Palm-rest and keyboard M2x6 assembly Battery Palm-rest and keyboard M2x3 assembly Battery-cable bracket System board M2x4 Palm-rest and keyboard M2x4...

  • Page 14: Removing The Base Cover

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Loosen the three captive screws that secure the base cover to the palm-rest and keyboard assembly.
  • Page 15 Remove the base cover carefully off the palm-rest and keyboard assembly. NOTE: The following steps are applicable only if you want to further remove any other component from your computer. Remove the two screws (M2x4) that secure the battery-cable bracket to the palm-rest and keyboard assembly. Remove the battery-cable bracket from the palm-rest and keyboard assembly.
  • Page 16 Removing the base cover...

  • Page 17: Replacing The Base Cover

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Connect the battery cable to the system board, if applicable.
  • Page 18 Align the base cover with the palm-rest and keyboard assembly. Carefully snap the base cover onto the palm-rest and keyboard assembly. Replace the six screws (M2x6) that secure the base cover to the palm-rest and keyboard assembly. Tighten the three captive screws that secure the base cover to the palm-rest and keyboard assembly. Replacing the base cover...
  • Page 19 Replacing the base cover...

  • Page 20: Removing The Battery

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.
  • Page 21 Remove the four screws (M2x3) that secure the battery to the palm-rest and keyboard assembly. Lift the battery off the palm-rest and keyboard assembly. Press and hold the power button for five seconds to ground the computer and drain the flea power. Removing the battery...

  • Page 22: Replacing The Battery

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Post-requisites Replace the base cover.
  • Page 23 Align the screw holes on the battery-cable bracket with the screw holes on the palm-rest and keyboard assembly. Replace the two screws (M2x4) that secure the battery-cable bracket to the palm-rest and keyboard assembly. Replacing the battery...

  • Page 24: Removing The Fan

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 25: Replacing The Fan

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the screw holes on the fan with the screw holes on the palm-rest and antenna assembly.

  • Page 26: Removing The Heat Sink

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. WARNING: The heat sink may become hot during normal operation. Allow sufficient time for the heat sink to cool before you touch it.

  • Page 27: Replacing The Heat Sink

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. CAUTION: Incorrect alignment of the heat sink can damage the system board and processor.

  • Page 28: Removing The I/O Board

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.
  • Page 29 Removing the I/O board...

  • Page 30: Replacing The I/O Board

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the screw holes on the I/O board with the screw holes on the palm-rest and keyboard assembly.

  • Page 31: Post-Requisites

    Post-requisites Replace the base cover. Replacing the I/O board...

  • Page 32: Removing The Speakers

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 33: Replacing The Speakers

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Using the alignment posts on the palm-rest and keyboard assembly, place the speakers on the palm-rest and keyboard assembly.

  • Page 34: Removing The Wireless Card

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.
  • Page 35 Removing the wireless card...

  • Page 36: Replacing The Wireless Card

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure CAUTION: To avoid damage to the wireless card, do not place any cables under it.

  • Page 37: Removing The Display Back Cover

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 38: Replacing The Display Back Cover

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the display-back cover on the display-panel and antenna assembly.

  • Page 39: Removing The Display Assembly

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 40: Replacing The Display Assembly

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure CAUTION: Place the computer on a soft and clean surface to avoid scratching the display.

  • Page 41: Removing The Display Hinges

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 42: Replacing The Display Hinges

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Align the screw holes on the display hinges with the screw holes on the display-panel and antenna assembly and replace the two screws (M2x3).

  • Page 43: Removing The Camera

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 44: Replacing The Camera

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Place the camera module on the display-panel and antenna assembly.

  • Page 45: Removing The Display Cable

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 46: Replacing The Display Cable

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Close the latch and connect the display cable to the display-panel and antenna assembly.

  • Page 47: Removing The Display Panel

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 48: Replacing The Display Panel

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Place the display panel on a flat surface. Post-requisites...

  • Page 49: Removing The System Board

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. NOTE: Your computer’s Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board.
  • Page 50 Remove the two screws (M2x3) that secures the system board to the palm-rest and keyboard assembly. Lift the system board off the palm-rest and keyboard assembly. Removing the system board...

  • Page 51: Replacing The System Board

    After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. NOTE: Your computer’s Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board.

  • Page 52: Post-Requisites

    Post-requisites Replace the heat sink. Replace the battery. Replace the base cover. Replacing the system board...

  • Page 53: Removing The Palm-Rest And Keyboard Assembly

    Before working inside your computer. After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Prerequisites Remove the base cover.

  • Page 54: Replacing The Palm-Rest And Keyboard Assembly

    After working inside your computer, follow the instructions in After working inside your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/ regulatory_compliance. Procedure Place the palm-rest and keyboard assembly on a flat surface.

  • Page 55: Technology And Components

    Special keys Dell Inspiron Chromebook keyboards have extra features to help you browse the web efficiently. The keyboard contains a dedicated search key and a new row of web shortcut keys. A standard USB Windows keyboard can also be used with the Chromebook, using the same keyboard shortcuts.
  • Page 56 Keys Description Decrease brightness Increase brightness Mute Decrease volume Increase volume Search applications and the web at the same time. On a Chromebook, this key is on the side, where the Caps Lock key is normally located. Lock Keyboard shortcut keys Table 4.

  • Page 57: Touchpad Gestures

    Touchpad gestures For more information about touchpad gestures for Inspiron Chromebook, see the Google Chromebook Help at support.google.com. Bluetooth This section outlines the instruction to pair a bluetooth device with your Chrome devices. Bluetooth technology lets you connect devices wirelessly over short distances. To use the Bluetooth accessories with your Inspiron Chromebook, first check if your Inspiron Chromebook supports Bluetooth.

  • Page 58: Software

    This chapter details the supported operating systems along with instructions on how to install the drivers. Operating system This page contains information about the operating system used by the Dell Inspiron Chromebook. Chrome OS Inspiron Chromebooks are powered by the Google Chrome operating system, based on Google's popular Chrome browser. It has been developed to provide a fast, simple, and more secure computing experience for users who spend most of their time online.

  • Page 59: Verified Boot

    • Fun games • Built-in support for popular file types and external devices For more information about the Chrome OS, please visit the Chrome OS training page. Verified Boot Read Only firmware verifies the integrity of Read/Write (R/W) firmware. R/W firmware verifies the active Linux kernel. During run time, the kernel verifies each block read from disk.

  • Page 60: Disk Partition Map

    Disk Partition Map There are two copies of Chrome OS on disk: an active copy and a backup copy. Each copy consists of a kernel partition and a root file system. The backup copy is updated automatically in the background. Users only need to reboot. The partition contains encrypted user data and is also used in the factory for storing test software.

  • Page 61: Developer And Recovery Mode

    Developer and Recovery mode Table 5. Developer and Recovery mode Developer Mode Recovery Mode • Used to boot without verification. • Allows a user to reinstall the Chrome OS from a USB key or SD card. • Can be turned on via key combination during boot. •...

  • Page 62: Chrome Vs Chromium Os

    This page contains all the information about viewing system information for the Dell Inspiron Chromebook. Dell Inspiron Chromebook does not support Dell BIOS. Hence, there are several ways to check system specifications depending on the information you are searching for. The table below lists some of the most commonly used methods to view system information and specifications.
  • Page 63 Table 7. View system information Commands Action and Purpose Screenshot chrome://help View basic OS information. chrome://settings View information such as screen resolution options (Device>Display settings), touchpad, and other basic hardware information. Software...
  • Page 64 Commands Action and Purpose Screenshot chrome://system View advanced system information such as the Google Chrome version, BIOS information, CPU information, memory information, network status, power supply information, etc. Software...
  • Page 65 Commands Action and Purpose Screenshot chrome://net- View advanced networking internals/#export information. Software...

  • Page 66: Troubleshooting

    Troubleshooting Basic troubleshooting This page contains all the information for Inspiron Chromebook basic troubleshooting. NOTE: Refer to Google Help Center for the online troubleshooter. NOTE: Resetting the Inspiron Chromebook, also known as Powerwash, can be attempted before Recovering the Inspiron Chromebook.
  • Page 67 Display issue Table 9. Display issue Issue Possible solutions Screen is Blank If the Inspiron Chromebook's screen is blank, try the following troubleshooting steps to resolve the issue, checking to see if the screen turns on after each step: Make sure the Inspiron Chromebook is on. If you are using the battery, plug the Inspiron Chromebook in and press the power button.
  • Page 68 Issue Possible solutions Try using different apps that use the camera. Try a Google+ Hangout or the onboard camera app Try rebooting the Inspiron Chromebook If the camera issues persist, try to Reset or Recover the Chomebook. Bluetooth issue Table 11. Bluetooth issue Issue Possible solutions Bluetooth issues...
  • Page 69 Issue Possible solutions If the backward or forward buttons do not work, check that the same icons in a web browser are not grayed out. For example, if the back button on a web page is grayed, this is because the browser is not aware of a page to move backward to.

  • Page 70: Crosh

    The Chrome OS does not support ePSA, Dell BIOS, the F12 boot menu, or DellConnect. There are no preboot diagnostics. All troubleshooting must be done inside the OS. Chrome Shell (CROSH) and the Chrome URL commands provide some troubleshooting tools, information, and advanced settings.

  • Page 71: Crosh Commands

    Press <Clrl> + <Alt> + <T> The interface appears as shown in the screenshot below: Type in the CROSH command for diagnostics. Type 'help' for a list of available commands. Type help_advanced to display a complete list of commands for debugging purposes Alternately, refer to CROSH Commands for the list of the CROSH commands available for diagnostics.
  • Page 72 Table 15. Advanced help command Command Purpose battery_test[<test length>] Tests the battery discharge rate for a given number of seconds. No argument defaults to a 300 s test. bt_console [<agent capability>] Enters a Bluetooth debugging console. The Optional argument specifies the capability of a pairing agent the console provides; see the Bluetooth Core specification for valid options.

  • Page 73: Commonly Used Crosh Command

    If not specified, it affects global behavior. Commonly used CROSH command This page contains information about the most commonly used CROSH commands to diagnose the Dell Inspiron Chromebook. Below are some of the most commonly used CROSH commands to troubleshoot a hardware issue.
  • Page 74 Type battery_test 1 into CROSH, and then press Enter. Check the result to confirm that the battery is charging. Check battery health Follow the steps to evaluate the health of the Inspiron Chromebook battery, and check the discharge rate: Disconnect the AC adapter from the Inspiron Chromebook. Turn on and sign in to Inspiron Chromebook.
  • Page 75 Press CTRL + ALT + T to open CROSH. Type battery_test 1 into CROSH, and then press Enter. A screen displays the current battery health and discharge rate. • If the Battery health percentage is greater than 50%, the battery is within the expected wear limits. •...
  • Page 76 • If the test results show that Battery is Unknown, the battery might need to be replaced. Checking memory Follow the steps below to perform a memory check for Inspiron Chromebook: NOTE: This will approximately take 20 minutes, and it also depends on the capacity of the memory. Turn on and sign in to Inspiron Chromebook.
  • Page 77 A diagnostic screen displays the result of the memory test passed without any errors. Example of a memory test failure. Troubleshooting...
  • Page 78 Checking network status If you are having trouble connecting to the Internet, use the steps in one or more of the following sections to test the network adapter: Follow the instruction to gather the information about the network and diagnose the network errors. Turn on and sign in to Inspiron Chromebook.
  • Page 79 Wait while CROSH performs a set of network diagnostic tests. A diagnostic screen displays the results of the network adapter health test. The diagnostic test log is saved as a.txt (plain text) file in the Files app. Troubleshooting...

  • Page 80: Chrome Commands

    More "Who am I" type of stuff Create Recovery USB Stick chrome://imageburner/ Google's version of DBAR/DBRM Chrome Flags chrome://flags Experimental features beyond the scope of what Dell supports Memory Troubleshooting chrome://memory View running processes and memory utilization Module Load chrome://conflicts...
  • Page 81 Purpose Browser Shortcut Explanation Credits chrome://credits References to all module/libs contributions and their respective wiki/license URLs Crash Reporting chrome://crashes Shows detailed crash report, if the feature was enabled Apps RAM Utilization chrome://appcache-internals Detailed memory usage for apps/extensions, especially handy for 2 GB Chromebooks Following are the 12 most helpful chrome:// commands that you should know: Table 17.
  • Page 82 Chrome Commands Purpose Screenshot chrome://downloads This is also available from the Menu > Downloads. Shortcut key is Ctrl+J. chrome://extensions This is also available from the Menu > Tools > Extensions. chrome://bookmarks This is also available from the Menu > Bookmarks > Bookmark Manager. Short cut key is Ctrl+Shift+O.
  • Page 83 Chrome Commands Purpose Screenshot chrome://history This is also available from the Menu > History. Short cut key is Ctrl+H. chrome://memory This will redirect to “chrome://memory- redirect/”. This will display the memory used by the Google Chrome browser. This also displays all the process related to browser with their PID, process name, and the memory it takes.
  • Page 84 Chrome Commands Purpose Screenshot chrome://quota-internals This gives information about the disk space quote used by the browser, including the breakdown of how much space the individual websites took under temporary files. chrome://sessions This displays the number of sessions and magic list that are currently running. chrome://settings This is also available from the Menu >...

  • Page 85: Reset Inspiron Chromebook

    Google, and sync statistics. Reset Inspiron Chromebook This page contains all information about resetting Dell Inspiron Chromebook. All local user data stored on the Inspiron Chromebook can be cleared by resetting it to its original factory state (also known as Powerwash).
  • Page 86 Click the status area in the lower-right corner, where your account picture appears. Troubleshooting...
  • Page 87 Click Settings as highlighted from the screenshot below. Troubleshooting...
  • Page 88 Click Show advanced settings to expand the menu. Troubleshooting...
  • Page 89 Click the Powerwash button. Troubleshooting...

  • Page 90: Recovering The Inspiron Chromebook

    Inspiron Chromebook again. Make sure you sign in with your primary Google Account, because this account is set as the owner account. Recovering the Inspiron Chromebook This page contains information about recovering Dell Inspiron Inspiron Chromebook. Install a new version of the Chrome operating system on your Inspiron Chromebook by going through the recovery process. You may want to go through this process if you are having problems updating your Inspiron Chromebook or if it stops working.

  • Page 91: Step 1-Check For The Chrome Os Is Missing Or Damaged Message

    Before starting this process, you need the following: • A Chrome device, Windows, Mac, or the Linux computer with administrative rights. • A 4 GB or larger USB flash drive or SD card that you do not mind clearing. Step 1-Check for the Chrome OS is missing or damaged message If you see this message, you can first try to perform a hard reset on your Inspiron Chromebook by pressing Refresh + Power.

  • Page 92: Reinstall The Chrome Operating System

    Operating System Instructions 1.Click this link to download the Recovery Tool. Modify the script permissions to allow execution with the following command: $ & sudo chmod 755 linux_recovery.sh Run the script with root privileges with the following command:$ sudo bash linux_recovery.sh Follow the prompts from the tool to complete building the operating system image.
  • Page 93 Question Solution You successfully recovered your Inspiron Chromebook but now you After you have completed recovery, you need to format your USB can not use your USB or SD card with Windows or SD card using the recovery tool. You successfully recovered your Inspiron Chromebook but now After you have completed recovery, you need to format your USB Windows does not recognize the whole size of the USB or SD card or SD card using the recovery tool.

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