The indicator light (usually red/blue) will start blinking rapidly. during this process.
This can be fixed in the Service Menu (usually Menu + 1147 or Input + 2580 ) under "Panel Settings" -> "Mirror." To ensure you get the exact version for your specific TV: What is the brand and model name of your TV? Download 3663LUA A81 1366x768 Firmware USB rar
Move the .bin file to the root directory of the USB (don't put it in a folder). Power Off: Unplug the TV from the power outlet. Insert USB: Plug the drive into the TV’s USB port. Update: Plug the TV back in. The indicator light (usually red/blue) will start blinking
Try a different USB drive or rename the file to allupgrade_3663LUA_A81.bin . Download 3663LUA A81 1366x768 Firmware USB rar
Unzip the downloaded .rar file using WinRAR or 7-Zip.