Xa2 flashed with Sailfish no GPS fix to obtain. Same Xa2 flashed with an AOSP derivative near instant GPS fix. 
I followed those threats and that made it so that I was able to get a GPS fix. I have MLS manager installed and the corresponding package for my region. Still over 2 minutes to get a GPS fix with high accuracy settings is a long time. That makes it kind of workable, but not in the instant you need it directly.