Sharp PN-L803C Service Manual page 132

The update is carried out at the ponit of the failure.
However, the update result OSD is not displayed. And, the OSD is not displayed during updating.
When the update is performed through USB flash drive, confirm the green LED that flashes repeatedly. This LED operation means
that the updating is carried out.
When the update is performed through LAN, confirm the display of the tool.
3) The main power in not ON.
Update via LAN cannot be done with this case. When the update via network is failed, perfom the update via USB flash drive.
In this case, turn OFF and ON the main power, and connect the USB flash drive. Then, leave the monitor for a given length of time.
By this way, the monitor is restored to its former state. When the USB flash drive is connected and the green LED flashes repeatedly,
the updating is carried out.
By this operation, only the failed part of the updating is carried out. Therefore, after this operation, perform the update procedure via
USB or via LAN from the beginning. (When the update via USB is performed, update result OSD is not displayed even if the USB flash
drive is connected. When the update via LAN is performed, "Update target is nothing" is displayed on the monitor.)
PN-L803C_80TC3 FIRMWARE UPDATE PROCEDURES 5 - 9