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?
Once the blinking stops or the TV restarts, remove the USB. ⚠️ Common Troubleshooting Download 3663LUA A81 1366x768 Firmware USB rar
Format a USB flash drive (8GB or less) to FAT32 . This can be fixed in the Service Menu
The indicator light (usually red/blue) will start blinking rapidly. during this process. Download 3663LUA A81 1366x768 Firmware USB rar
Try a different USB drive or rename the file to allupgrade_3663LUA_A81.bin .