Extract the .rar file and copy the firmware file (often named MST6M181.bin or similar depending on the version) to the root directory of the USB drive.
Power on the board. The indicator LED (if present) will typically flash rapidly during the update process.
Format a USB flash drive (ideally 4GB or smaller) to FAT32 .
Once the LED stops flashing or changes color, the update is complete. Remove the USB drive and restart the board.