After browsing through the most relevant threads I could find ([Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]), I see that I do indeed require the assistance of forum experts such as kunix and catymag.
I certainly wish I found this forum early enough to make a backup of my NV, but alas I had no need for any such measures while the GPS was functional. Mend your roof before it rains, as the saying goes.
Incidentally, ASR & BT seem to be fully functional.
I actually used the GPS earlier in the day, so thanks again for everyone who's contributed to the thread. A forum donation is forthcoming.
Till now always when erase reg 41 i can update maps over mapupdater and nuvi ID always was there, only model number desapire.
I go to my garmin and there is nuvi recognized and i can download map and that map is unlocked when is downloaded.
I used Mapupdater v3.2.2. It re-downloaded all the map content (it uses a different download directory than Garmin Express), but refused to install to the device, giving me the same error message as Express.
Kunix has graciously helped me restore my model # to 2460, and I was able to install the complete map set via Express.
The levels of helpfulness & expertise on this forum are truly astounding. I have learned a great deal about Garmin GPSs over the last 2 days.
I do have 2 questions, answers to which I think would be extremely helpful to people encountering similar issues:
Is it possible to clear NV memory in a non-bootable device without erasing the entire rgn41?
My current GarminDevice.xml (and hence, I'm assuming, rgn41) is missing the RegistrationCode and the Unlock Codes present in my original one. I seem to be able to install maps my device is subscribed to without an issue. Are there any ramifications to the missing information, and is there a way to re-populate the NV with it?
"The update is unable to determine where the specified map file should be written. Please contact Garmin customer support: http://www.garmin.com/contactsupport".
Loly are you doing something to enable MU to install/reinstall LM maps? The map img download is not the problem, both programs for me simply baulk on transferring them onto the device.
Regarding MyGarmin, loly are you saying that if you attempt the map update/reinstall with MU and it baulks you can then go to MyGarmin and complete the dl there. Again, if so, i can't replicate that either.
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Unit ID is not in reg 41,I know. If you erase 41 Unit ID wont be erased. I though he flashed something else after that to restore model n.and nuvi lost Unit ID.
But better not to expain more here.
No way to readd codes and registration date, I have the same in my 3790, but no problem with myGarmin and updates.
I lost model n and I couldn't update with my Lifetime at myGarmin, MU etc. I restored model n. and all returned ok because infos are stored in Garmin's records .
This happened before we knew how to backup NV, in first attempts in 37xx to 34xx conversion ,so I lost codes forever.
Kunix sent me a program to restore them but failed. Probably it works with 1XXX series.
Loosing Unit ID is another story a bit more complicated and, as I know, service cable is needed if you don't have backup.
Thanks for the clarification, catymag!
What if one was to erase rgn41 before registering the unit with Garmin? Would their records still link your Unit Id to map subscriptions, etc.?
Can you share the region Unit ID is stored in, so that one knows which NV region to restore from a full backup in the event of a loss?
Also, it seems my question regarding clearing NV on a non-booting system has gone unanswered. Should I start a new thread regarding it?
In any case, I believe my initial request can be considered "SOLVED" for the purposes of the thread title.
I've looked at region 41 some time ago in the hex editor but it seems to be xored or encrypted with 3ac5 or something similar.
It also seems to be made up of a lot of data blocks (repeated) Some populated with Data, some not.
Once I even managed to find the unitid (xored) and it was repeated may times. (once per data block I recall)
I could never find the model number.
The file is dynamic and changes after reboot adding files etc etc.
I would appreciate more info on this file.
The difference between stupidity and genius is that genius has its limits.