I’ve bought a cheap Nüvi 775T with a broken on/off-switch. I solder another on/off-switch and the 775T works again – but with a strange behavior! I changed the settings, turned the 775T off and on again, my settings are disappeard and the old settings are back. I deleted old maps and some voices, turned it off and on, the maps and the voices are back again. The „GarminDevice.xml“ stays on the date „04.10.2011“ after every new start!

The 775T has fw 2.30. I flashed newer firmwares with Garmin-updater.exe successfully, after reboot the firmware is back to 2.30. I made a hardreset successfully (change country and language), turned it off an on again, the old settings are back.

I tried to format the 775T with Windows XP – fail.
I tried to format the 775T with Windows 7 – fail.
I tried to format the 775T with HDD Low Level Format Tool 4.25 – fail.
I tried to format the 775T with RMPrepUSB – fail. (all several times)
Then I tried a Quick Size Test with RMPrepUSB and get this result:

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Is there any chance to cure the memory chip?