My wife's Droid Eris w/2.1 installed. Every time I try to use the Navigation portion of maps, it force-closes saying "The application Maps (process com.google.android.apps.maps) has stopped unexpectedly. Please try again." Also, I go into the market and see there is an update for Maps. It downloads OK, but when it goes to install, it say "Package file was not signed correctly." I tried going into Applications and clearing Data/Cache, but still no fix. I am one step away from doing a Hard Reset of this thing. I just need it to last her until the Droid Incredible I ordered for her to come in (2 weeks-ish). To make matters worse, someone stole her GPS from the car last night and she wants the navigation on the phone at least for now.:icon_evil: EDIT: I guess I did a "bad" thing and rooted it to go from 1.5 to 2.1 instead of waiting for the OTA... I didn't realize I was rooting it at the time. Others have noticed the same issue with the Google Nav after rooting and I don't see a fix. Is there a sure-fire way to "un-root" the phone and go back to 1.5 and just deal with the OTA updates from Verizon?