Y1639735128286 , via OnePlus 9 , Jan 19, 2022 : OnePlus should resume OTA update for OnePlus 9 and 9 pro as they stopped it earlier in December ( only for those who didn't update in oxygenOS 12 at that time ) now even after server update, many users still on oxygenOS 11,they are confused should they try updating manually or wait for OTA update.
