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When 2013.10 came out, I updated my 750 with no problems (had to put it on the SD card to get all of the NA updated on there though, but that was expected). Saved the map to my HD also. Daughter needed a Nuvi for her new car, so I bought a 50LM. Updated the firmware out of the box and then did the map to 2013.10. After update I got the dreaded 'no maps to unlock' message and no copyright info for the maps on boot up of the Nuvi. Redid the update several time, using option 2 from myMaps.
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Checked the unlock text file and the correct code was in there, but it would not unlock. Thinking something was bad in the unit and it being a Sunday with her leaving back to college in a few hours, I went back to swap the unit out at the store. They were out (one time buy at Sam's Club), so I upgraded to a 2455LM. Went to do the updates on the 2455LM and same thing as the 50LM (no map to unlock). Daughter was leaving in 2 hours to go back to college (several hours away), so I reloaded the factory maps from the 2455 which I had backed up. At lease she had a working unit and I will call CS next time she is home during Garmin business hours.
So a week later (today), my other daughter wants her 1350 updated (still had 2010 maps on it). Exact same thing. At least she is home from college and I can call Garmin CS tomorrow.
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So after all that, here is my question. Where does Garmin store the map update files on a PC when they are downloaded?
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I think the map it downloaded for my 750 must have embedded code unique to that device and even though the Garmin update software is looking and seeing the map on my drive from the prior download, something is not getting changed when I try to update the other maps. I want to purge all the map files from my hard drive and force a fresh download of a map for the specific Nuvi I'm updating and see if that fixes the issue. I don't recall seeing anything posted about this issue before, but I think the update software may not be fully checking for and replacing any device unique code for additional map updates to additional devices from the same PC (all devices have current lifetime updates in MyMaps and I'm not trying to copy one map manually to another Nuvi - it's all being handled by either the lifetime update software or the option 2 map update package from the garmin site).
The map update software is clearly using a stored set of data from my drive as it is not re-downloading the map from the Garmin server. Ok, I found the problem and a solution. Apparently the lifetime updater and the option 2 manual updater from the MyMaps area at Garmin do not fully determine what Garmin device is attached and correct the map to match the encoded unlock keys if you have more than one Nuvi device to update and a map was previously downloaded. Works fine for the 1st device, but apparently the files stored from the first download are also used to build the maps for any additional Nuvi device updates and the unlock codes do not match the other devices (we had 3, all with lifetime maps, one was that way when purchased and the other two had maps purchased later). The updaters apparently see the current map files are already on the PC, but don't change the embedded unlock codes for the subsequent devices when building the map again. It put's the right code in the unlock file, but that code does not match the map file. First Nuvi updated fine.