Thread: How to backup Nuvi NV (region41) with sd

@quebec001
Three points:

• As said in Post #227, if it has hidden RWFS partition, the path to the card is '2' not '1'. Using '1' will write to RWFS in such a device.
• If region 154 is populated then either (i) region 41 is empty (or even absent), or (ii) it duplicates region 154.
• If it has an RWFS partition and writes nonvol to only one of 41 or 154 it will use 154 for sure.

I've not got access to a Montana 680 to check but I'd be surprised if it's not an RWFS device. You can easily check that on the device: Touch 'Speed' field on "Where To?/Map" page. Hold center of speedometer for ~6 seconds to enter Diagnostics Page and scroll down. If 'RWFS Settings' is present then the card's path is definitely '2' and nonvol region is 154 so just use "rrgn,154,2:/154.bin". You can alternately access that page by holding the top right corner of the Volume page in modern devices. Montana may be different.

Regardless, there's no problem to write all possible combinations as commands:

Code:

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If you do that with an RWFS device and both regions contain the nonvol you'll end up with 4 copies of nonvol, 2 on the RWFS partition and 2 on the card. If 41 is empty or absent you'll have only one filed BIN in each of RWFS and card and the other 2 commands will return 'error' instead of 'success' in update.log or there will be an empty [zero bytes] BIN file also. If the path '2' isn't valid then you'll only have one or two bin files on the card. This is a copy of update log from a nuvi 2797 which got 4 bin files, none of them empty, all 6,422,528 bytes:

Code:

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If you do have that don't forget to remove any backup 154 and/or 41 BIN files from the root of the RWFS partition. In such a device you should only keep the 154 BIN backup as although the sizes may be the same there can be slight differences in the data and flashing a copy of 41 to 154 may prove very problematical.