The rrgn command should work in any nuvi. Check you don't have a space before rrgn, although it doesn't look like you have from the log. Try using a different microSD or if you don't have one reformat the one you have using [Only registered and activated users can see links. ], or this: [Only registered and activated users can see links. ]. Some cards are flaky and if the format is not just right nuvis will not play nice with them.

If that doesn't help, please post the ldr.bin and update.txt files you used as kunix asked. He's the expert is this stuff. BTW, '1' is the correct path for 2012 devices.