Question about Garmin Nuvi 660 GPS Receiver
After upgrading my maps from Australia 2007 to 2008 Garmin would not allow me to purchase an unlock code. Can I return my GPS to the original setting of map 2007. Your help would be appreciated. Thank you
You will have to contact garmin to get the unlock codes. the cost will be negligible as under service charge.
Posted on Jun 28, 2008
It would seem that the error message "Can not unlock maps" is caused by a fault during the file transfer from your PC to the GPS. Other users have this same issue and a discussion centering around this particular fault maybe found here.
If you would recall, the maps were initially already unlocked in Mapsource (in the early stage of the update process) Unlocking them again using the utility in the Mapsource may also cause this glitch.
Alternately, some have found that editing the gmapprom.unl file by deleting the initial letter (U), would make the codes to be 25 characters which should now work. Pls verify that your nuvi is plugged into you PC, thereafter go to "My Computer", click on the nuvi/garmin drive and find the Garmin file and the gmapprom.unl file. Make the changes mentioned above and your maps will unlock.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Jun 28, 2008
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Posted on Jan 02, 2017
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