@george59
One of 2 possibilities:
1. You have a locked img. Run gimgunlock on it.
2. You have not placed the img file correctly. For 1xxx series in microSD, it can either go in a root folder Garmin, named as gmapsupp.img only, or it can go in a root folder Map as 'anyname'.img e.g. TSM_NT_2012.30.img or any other name within reason using latin letters..