Quote Originally Posted by dtrack View Post
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one question though, is there any danger of bricking my device if I remove the current map and replace it with the 2015 map?
There is only a chance of 'bricking' if the map file is faulty. Open it in GMAPTool first to check for errors. If it's ok there it'll be ok on the unit. I agree 100% that it's better to use unofficial unlocked maps on SD only normally, but your situation seems to be that your current downloaded maps inexplicably don't work on SD. I only suggested that for them you try on the unit, however seeing you're now downloading a tested map it should work on the SD.

Is it just a matter of re-copying the original files back to the device and everything goes back to normal?
Yep.