Likes: 
Have you tried to re-flash the device in pre-boot mode ? I think that you did this already:
Maybe you can try to flash Garmincure3 in cure mode and then try to format using rmprepusb.
Try this from dos box chkdsk F: /F (nothing to lose)
Most likely faulty flash chip.
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Thread: Nüvi 775T - write protected?
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14th May 2013, 05:01 PM #1GPSPower Helper
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14th May 2013, 05:41 PM #2Junior Member
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Hello dasilvarsa,
no luck at all: I flashed the 775T with Garmincure3 in cure mode successfully, then formatted it with RMPrepUSB also successfully, rebooted it and stuck now in „SYSTEM SOFTWARE MISSING“. Windows and RMPrepUSB don’t recognize it anymore.
One comfort: I can get in pre-boot mode and Garmin-updater recognize the 775T. Is there a way to get it back to mass storage mode?
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