How to backup Nuvi NV (region41) with sd

**kevindd992002** · 30th March 2013, 01:24 PM

Originally Posted by kunix

kevindd992002...

Oh ok. I did try flashing over an SG/MY 3790 firmware over my 3790US device in the past successfully but did not backup my NV initially. If I back it up now, is it still the virgin NV?

So if you use the "clear nonvol" button, you lose all the important info?

**kunix** · 30th March 2013, 01:40 PM

No, it's not virgin now.
For example, I remember that after flashing some asian firmware on nuvi 13xx/14xx european firmware started crashing when entering some menu because the asian firmware has written a wrong selected menu item number to some NV record because it used that particular record for a different purpose.
But such problems usually are solved by pressing "clear nonvol". The real problem comes if your device doesn't boot at all. Then you would have to erase NV with "ergn,41" (and loose your model number) or restore it from a backup with "xrgn,41" (and loose nothing).
So I would suggest you "clear nonvol" and make a backup now.

Yes, "clear nonvol" erases a lot of info, including all your settings. But you don't loose anything which can't be restored when performing "clear nonvol".

**kevindd992002** · 30th March 2013, 04:03 PM

Originally Posted by kunix

No, it's not virgin now...

Got it. So it's always better to first clear nonvol first before making the backup nv instead of backing it up right away?

**catymag** · 30th March 2013, 01:22 PM

It depends on what you do: flashing different firmwares is risky and if something goes wrong you can brick it or you can have some loss . For example model number or unit ID loss. NV backup preserves to trash your bricked unit or to ask for help to revive it (if possible)
I think if you flash something different in Nuvi from what is standard, you must have a bit of knowledge about what are you going to do. If you have it ,you surely backup your Nuvi NV

Uh kunix was faster lol

**catymag** · 30th March 2013, 01:44 PM

more infos about Clear Non Vol
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**kunix** · 30th March 2013, 04:11 PM

kevindd992002
Yes. Also "clear nonvol" is frequently needed when flashing non-standard firmwares (two times: before flashing and after flashing) and when returning to original firmware (two times also).