The final stable build of Android 10 is expected to release in the first week of September 2019. OnePlus 7/7 Pro, as well as OnePlus 6/6T, owners can expect the stable update (probably as OygenOS 10) by September or December 2019. Manufacturers like Xiaomi, Essential, Nokia, etc. have also started the latest Android 10 beta test on their supported devices. It means many non-Pixel devices will get the next major Android update earlier than usual.

System functions improvementSystem stability improvementAdded the OnePlus full-screen gestures

Application compatibility problemsCompatibility issues with Google PayLow probability of system lag and stability issues

An important change in this update is the OTA update support. Android Q Beta 4 (DP4) users will get this update via OTA (over the air). Also, you can upgrade the system via OTA to OxygenOS Open Beta from DP5 build. You can download the DP5 build from below link and install it via Local upgrade method.

Android 10 Beta 6 for OnePlus 7 Android 10 Beta 6 for OnePlus 7 Pro

You can always go back to previous Android 9 Pie (OxygenOS 9.5) by flashing the downgrade package. Download downgrade ROM for OnePlus 7 and 7 Pro and flash it via Local Upgrade method. (source – OnePlus)