I've seen a similar error [Only registered and activated users can see links. ]. Can you flash an RGN file with the original firmware?
0C 80 A0 E3 is the right patch for nuvi 12xx, it should work on a healthy device.
Also you can try [Only registered and activated users can see links. ] to access the internal flash drive. It's almost the same as QuickCure3.rgn, but it has a flasher application.