Oh boy! Somehow it's had Edge 500 firmware flashed to it. The correct HWID for GVN 53 is 0741, HWID 1036 belongs to Edge 500.
The way these units are updated is by placing the new firmware [Garmin calls it 'Unit Software'] named gupdate.gcd in Garmin folder on an SD card. As they do not have a true preboot mode, it seems it's not possible to flash an RGN file via Updater.exe, therefore the Edge firmware mustn't have been flashed to it that way.
There are a few things we can try. We'll do the obvious one first as per Garmin's recommendation for the device. Go to this page:
Read the 'Installation Instructions' carefully then download the V2.50 firmware [GVN53_250.exe] from the link. If flashing the correct firmware that way doesn't work we'll then look at other options.
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