Ulefone BeTouch 3

I have a Ulefone BeTouch 3, android version 5.1. I've been messing with it a bit (rooting, partitions etc), and it's began to deteriorate software wise (after a restart, the battery drops by 80%, it often doesn't receive texts, the fingerprint lock doesn't work, the wifi keeps restarting).

I want to flash the phone and totally restart, but I'm not quite sure how. I looked at the ulefone website (ulefone com) but couldn't find the file they referred to (the file being the...

Ulefone BeTouch 3

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