Thread: Garmin nuvi 765 "system software missing"

sucro

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So you can see yourself that all requests to erase (ergn), read (rrgn), write (xrgn) region 14 give an error. But the interesting thing is that the rrgn command partially succeeds and gives the first 0x1000 bytes of the region, and only then it fails. 14.bak and 14.dmp are equal and they are not equal to 14.bin. So xrgn doesn't change the region contents at all.
I think it's a hardware issue and we can't cure it with pure software methods.