I have an XA2 dual sim as well. What worked for me: I started gpsinfo and put the phone somewhere where it could see the whole sky, where it got a fix, eventually, after a really long time (maybe an hour). After that, when I use GPS regularly, it still takes (too) long, but considerably less time than the first time (I assume because it “remembers” information like orbital elements of the GPS satellites, which it would otherwise get from the internet)
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