I bought a nüvi 465T on eBay which is stuck in a continuous reboot cycle of 5 seconds. It powers up, shows the splash screen for a few seconds, then briefly flashes a fully white screen and then reboots.

I am able to get it in pre-boot mode and successfully used GarminCure3.exe and Updater.exe to flash cure FW v4.20 into the unit. However, it still reboots continuously (both on external power, as on USB cable linked to the computer).

Any other suggestions to fix this unit?