You mean to restore using a Non Volatile backup i guess. Provided the unit can still read from the media card to take commands from update.txt, to restore a nv region [41 being the most likely] the txt file would read something like this:

xrgn,41,1:/41.bin
reboot

Where in that case the 41.bin file to be written to the unit would be placed in the root of the sd.

If you wanted to also first backup your existing region 41, a two step command:

rrgn,41,1:/41_backup.bin
xrgn,41,1:/41.bin
reboot

Then the unit's region 41 would be overwritten after firstly being backed up.

To be absolutely safe, the backup and overwrite can of course be done separately.

More info if you need it is here Carlos: [Only registered and activated users can see links. ] [where your first 'model loss' thread gets an honourable mention and a link] and here: [Only registered and activated users can see links. ] for some more in-depth info on commands from sd generally. If you're still hazy on it, post again in the Backup Region41 thread. Cheers.