I have a friends Nuvi 1390 which is stuck in the normal reboot loop. HWID 972 and runs Software 3.6. Unit goes into Preboot mode, tried many cure firmware including 2.1, 3.3, 4.4, 5.1.
However updater cannot seem to write the cure firmware to device. As soon as updater goes into "erasing" mode the Garmin resets. Then I get error message from updater "The GARMIN device is unable to program the requested memory region"
Anything I can try?