The .rar file is a compressed archive that typically contains:
Power on the board. A light on the keypad or board will typically begin flashing (often red and green or rapidly blinking red). Download RD8503 Sony 1366x768 rar
Place the .bin file in the root directory of the USB flash drive (do not put it in a folder). Execution: Insert the USB drive into the board while it is powered off. Download RD8503 Sony 1366x768 rar