the .rar file and copy the firmware file (usually ending in .bin ) to the root of the USB drive. Power Off the TV/Board. Insert the USB drive.
until the blinking stops or changes color (usually 1–2 minutes). Remove the USB and restart the device. Download R83 A81 1366x768 Firmware USB rar
: A popular repository for universal board software. Download R83 A81 1366x768 Firmware USB rar