Ok, I find the the information about how to make a hard reset. But how can I delete the gupdate under .System?
The steps should be.
1. Create your own gupdate.
2. Copy to SDCard \Garmin\gupdate.gcd
3. Make a hard reset.
5. Delete gupdate.gcd unter .System (How?)
6. Rename folders (Voice, Text, Keyboards) (Over USB?)
7. Make another hard reset.
8. Rename the folders back to original. (Over USB?)
9. Hope and pray!?