I lost the GPS and Blue Tooth audio after upgrading to the "NON-Official 3.0 firmware". Is this an easy fix? I have the F90BT. Thanks.

I also have this problem (f700). Haven't figured it out yet, but the GPS is not locating any satelites.

Edit: Solved

I solved the problem I had. The SDcard I was using for the update was corrupt/faulty.

I switched to a new one and redid the update from scratch, worked perfectly. Maybe try messing around with a different card and redoing the update will solve your problem too?