E1527011990281 , via OnePlus 6 , Nov 9, 2019 at 10:52 PM : So with backup in hand and having downloaded the A10 full, stable zip I was ready to reinstall/restore everything after upgrading from A10 beta. After all, this is what the local upgrade implied, that the process would wipe my phone. Low and behold, the local upgrade did not wipe my device and so far, no issues. Keep in mind I'm not rooted or unlocked. and I didn't have to revert to pie beforehand! YMMV, please make a backup, always better safe than sorry! considering that you could upgrade from stable pie to 10 beta it makes perfect sense that you can go from beta to stable.