If you'd like, I can help you find a for this board or search for step-by-step flashing instructions for this specific model. TCL LE32D99 MAIN TP.MS18VG.P77 SCH - Elektrotanya

Databases like Elektrotanya may provide related schematics or service manuals for the P77 chassis.

For standard software updates via USB or Wi-Fi, always check the TCL Support Site first.

Commonly found in the TCL 24F3300 and other models like the TCL 32B2600.

Sites like Monitor.net.ru or Kenotrontv.ru often host dump files for various TCL boards.