Bios Recovery Using Usb Drive; M-Bist - Dell Latitude 7420 Service Manual

h. Copy both the BIOS files BIOS_CUR.rcv and BIOS_PRE.rcv to the recovery folder on Local Disk (E).
i. In the Command Prompt window, at the DISKPART prompt, type set id=DE.
After the executing this command, the partition Local Disk (E) will not be accessible by the OS.
5. Shut the system down, remove the hard drive, and install the hard drive into the original system.
6. Start the system up and boot to System Setup, in the Maintenance section ensure that BIOS Recovery from Hard Drive
is enabled in the BIOS Recovery section of the setup.
7. Press the power button to shut the system down.
8. Holding the Ctrl and Esc keys, press the power button to start the system up. Keep holding the Ctrl and Esc keys until the
BIOS Recovery Menu page is displayed.
Ensure that the Recover BIOS radio button is selected and click Continue to start the BIOS recovery.

BIOS recovery using USB drive

About this task
NOTE: Ensure that you have the file type extensions visible in the operating system.
NOTE: Ensure that you have downloaded the latest BIOS from the Dell support site and save it on your system.
Steps
1. Browse to the location of the downloaded BIOS update executable (.exe) file.
2. Rename the file to BIOS_IMG.rcv.
For example, if the file name is PowerEdge_T30_0.0.5.exe, rename it to BIOS_IMG.rcv
3. Copy the BIOS_IMG.rcv file to the root directory of the USB key.
4. If not plugged in, plug in the USB drive, restart the system, press F2 to enter the System Setup, and then press power
button to shut down the system.
5. Start the system.
6. While the system is starting up, press the Ctrl+Esc keys while holding the power button until the BIOS Recovery Menu
dialog box is displayed.
7. Click Continue to start the BIOS recovery process.
NOTE: Ensure that the Recovery BIOS option is selected in the BIOS Recovery Menu dialog box.
8. Select the path on the USB drive where BIOS recovery file is stored( root directory or "\") and follow the on-screen
instructions.

M-BIST

M-BIST (Built In Self-Test) diagnostics tool, featuring improved accuracy in system board failures.
NOTE: M-BIST can be manually initiated before POST (Power On Self Test).
How to run M-BIST
NOTE: M-BIST must be initiated on the system from a power-off state either connected to AC power or with battery only.
1. Press and hold both the M key on the keyboard and the power button to initiate M-BIST.
2. With both the M key and the power button held down, the battery indicator LED may exhibit two states:
a. OFF: No fault detected with the system board
b. AMBER: Indicates a problem with the system board
Troubleshooting 83