Hello, I was recently given my friends old 520 to use and I wanted to install more detailed maps on it. Since it is a regular 520 and not a 520+ I would have to replace the basemap. I found a video and links from DCrainmaker using BBBike to create the .img I wanted to use and the loading it on the unit. However whenever I do that I get an error that says it cannot unlock the map. I saw a thread from a while back about how to use basecamp to get around this but the thread is gone. I haven't been able to import any of the .img files into basecamp or get the unit to like them. I have tried Garmin BBBBike (latin1), Garmin BBBike (UTF-8), Garmin OSM (latin1), Garmin OSM (UTF-8), Garmin Cycle (latin1), Garmin Cycle (UTF-8) and some others and so far nothing. Thanks in Advance for your help!