I took your advice and my nuvi 660 works again. Is there a way to do a backup Nuvi NV (region 41)? I followed the instructions, but Update.log says

Parsing "rrgn, 41.2 :/ 41.bin"
Error
Parsing "reboot"
Succes

41.bin file is 0 kb.


When "rrgn, 41.2 :/ 41.bin" Replace with "rrgn, 41.1 :/ 41.bin" nothing happens, no file 41.b5n.

I've tried several different SD cards.