I�ve bought a cheap N�vi 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?