Thread: Nüvi 775T - write protected?

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?