Thread: Nüvi 775T - write protected?

Try flash with Original or Cure FW again if you then have mass storage access.
What HWID use your nuvi?

HWID is 870, I’ve flashed it with „087001000440.rgn“ again successfully (Cure- and Original-Fw). After I seperated the 775T from USB, it reboots and nothing changed.

Now I flashed the 775T with „QuickCure3-with-flasher“ also successfully, but after the reboot nothing changed. It’s strange.

Another experiment: I flashed with Garmincure3 and „087001000450.rgn“, stayed on USB, then I flashed immediately with „QuickCure3-with-flasher“ and it shows the error „EXCEPTION: cannot flash region 12“.

Any ideas?

Note by MOD: I merged your 3 post : 3 sharks that I run into my eyes are too many Use the button Edit post,please. Thanks for understanding

Yes, you are right. First I want to go back to mass storage mode. Windows and RMPrepUSB don’t recognize my 775T anymore. That's why I couldn’t format it. USBDeview recognize my 775T. It isn’t dead.

Yet another experiment: I tried to backup region 41 with a sd-card. I write this command :

rrgn,41,1:/41.bin
reboot

in update txt on the sd-card. But my Nüvi 775T backup region 52 (not region 41) up to 78% then it stop and reboot.

I think, the 8Gb memory chip in the Nüvi 775T is in great confusion. Does somebody know a tool or a software to cure it?