Patched Start 50, map from sd card won't load?

Got burried under work, so hadn't had a chance to try this again til tonight. Everything is up and running properly after removing the patch, restoring back up and restoring to factory settings; then patching again.
So not sure what happened, going to hazzard a guess the previous owner had the patch on the old navcore and didn't remove it properly? I don't know. Just glad to have it up and running properly now!