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Blackview BV9900 rooting / LineageOS GSI?

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not sure if you're still looking but I managed to install LineageOS 18.1 GSI on my BV9900 just this week. Not perfect (I have no fingerprint, screen wakes up when it shouldn't, TWRP cannot mount /data, Google Pay not working...) but seems mostly okay. Will do some more work to see if I can get at least some of those things working.

As for rooting the stock system, I believe the unofficial TWRP should work - the recovery worked for me (the SP Flash method with some hacking).

As for LOS, I believe this is the best instruction set for this phone. As I mentioned at the beginning, I got the LOS 18.1 GSI working eventually. I even got the GAPPS working in the end, flashed via TWRP after some resizing magic, and registered with Google accompanied by repeated wiping.. :D

Good luck and let me know if you have success (especially with the things that don't work for me, pretty please).