Thread: Trying to unbrick a zumo 220

Received a bricked zumo 220 from a friend. Symptoms are that the unit freezes on the Garmin splash screen when switching on. When connecting to a PC via USB, it reboots every 6 to 10 seconds. Actions taken so far:

1. Used G7ToWin to confirm HWID (1138) and FW version (3.00).
2. Flashed CURE FW via GarminCure3.exe and Updater.exe.
3. Unit is now recognised and visible as an external mass storage device.
4. Made a backup of all files and folders, including hidden ones.
5. Formatted the unit via RMPrepUSB.
6. Flashed ORIGINAL FW via GarminCure3.exe and Updater.exe.
7. Unit is back to the original (faulty) symptoms.

Repeated step 2 and used WebUpdater to flash original FW into the unit plus some additional files. Result as in step 7.
Repeated step 2 and used Garmin Express to update software in the unit. Result as in step 7.
This is strange, because after step 5 one would think any corrupt file would have been removed.

Does anyone have other suggestions how to get this unit working again? Thanks!


Edit 1:
Additional details:
- When switching on the unit on battery power, it shows the Garmin splash screen for about 3 seconds, then switches off and stays off.
- When switching on the unit on wall adapter power, it shows the Garmin splash screen and freezes.
- Unit no longer shows continuous reboot when on USB cable to PC but remains in mass storage mode.

One would think the first observation could be caused by a flat battery. However, when using the same battery in a nüvi 550, it shows full. When using the (full) battery from the nüvi 550 in the zumo 220, it still shows the same symptoms as described before. Could it be that a critical region (41?) is damaged and needs restoring?


Edit 2:
Tried to backup region 41 but it seems the unit does not read from microSD during boot.