Solution: This is often a "brick." However, if the verified file is the correct match for the 59GA hardware, this can usually be recovered. Remove the power, take out the SD card, rename the firmware file to a "force flash" name (if provided in the package manual), reinsert, and repower. If this fails, you may need to short the SPI pins (requires technical skill), or contact the seller for a recovery tool.
Because these boards are made by small OEMs, manufacturers do not maintain official download pages or version histories. Instead, enthusiasts and technicians share firmware files on: jxv29 59ga v16 firmware verified