If you are dealing with a white-label display or industrial device and the standard firmware update fails, having a backup is your only safety net.
Place the extracted firmware file directly onto the root folder of your newly formatted FAT32 USB drive. Do not place it in a subfolder. vg421wdv2 firmware 2021
Ensure the file name matches exactly what the manufacturer specifies. Some bootloaders will only recognize a specific file name (e.g., MERGE.bin or auto_update.bin ). If you are dealing with a white-label display