ganthan wrote:Few things to double check...
1. Are you installing the MFM map in SD Micro Card? - Yes
2. Before installing the latest map, did you delete the old MFM map into Trash & Empty Recycle Bin? - Yes By right the old map should be deleted first before you copy the new MFM map into the SD Micro Card. Make sure you don't have 2 maps in the same Maps folder. - Yes deleted all old files. I have been doing this for years - problem is this Nuvi 3970's software I think. Why old map can new cannot?
Thought it was the SD card, replaced it still same problem.
Are you using Windows 7 64 bit by any chance? I am. I found that if you safely remove the gps, the file got "undeleted" and the new file you copied was lost. So after copy is completed I wait a few minutes and just unplug the GPS.
Dangeerous I know but that's what I've been doing. I am using SG/MY 3790 and I updated to the latest map without any problem.