Identify the LCD controller model and firmware file
Download the correct flashing tool from the manufacturer
Back up the current firmware if supported
Power off the display and disconnect it from the system
Connect the controller to the flashing interface
Use the required cable, USB adapter, or programmer
Put the controller into bootloader or update mode
Open the flashing tool on the computer
Select the correct firmware file
Select the correct COM port or device
Verify the target device and firmware version
Start the flashing process
Wait until flashing completes without interruption
Do not disconnect power or cable during flashing
Confirm the tool reports success
Power cycle the controller after flashing
Reconnect the LCD panel and test operation
Check display image, backlight, and touch function if applicable
Restore settings or calibration if needed
Repeat only with the exact firmware intended for the controller model