The service manual for the Sharp LC-32LE150M Go to product viewer dialog for this item.
The LC-32LE150M generally does not support USB user upgrades for major firmware revisions. Firmware updates are usually performed via an ISP (In-System Programming) programmer by writing to the Flash IC (usually a SPI Flash chip like 25Q series) on the Main Board. This is detailed in the advanced repair section of the manual.
Sharp LC-32LE150M service manual, Sharp LC-32LE150M schematics, Sharp LC-32LE150M troubleshooting, Sharp LC-32LE150M power supply repair, Sharp LC-32LE150M backlight fix, DUNTKE156FM01.
button on the TV (not the remote) for 30 seconds, then wait 2 minutes before plugging it back in. Hard Reset (Service Mode) Unplug the AC cord. Volume Down buttons on the TV simultaneously.
Vintage electronics sellers often sell official reproduction service manuals on CD-ROM for $10-$20. These are exact scans of Sharp’s internal documents. Search for "Sharp LC-32LE150M repair CD".