I dont take any responsibility for this guide, just in your decision, I didnt test it yet.
You can try to reflash with A11 open beta if it is possible due to date of roll out (latest is 3, as I know well, look here
https://www.xda-developers.com/oneplus-8-series-oxygenos-11-open-beta-3-canvas-aod/), next use guide for downgrade: You can go back to Android 10 from 11 by downgrade (you will lose all data):
Make sure you follow the instructions in the first post of the Open Beta 1 thread (included below) and download the correct version for your device/region. Also, as stated in the instructions,
roll back will wipe your device, so back everything up first.
https://forums.oneplus.com/threads/...eplus-8-series.1296568/page-214#post-22148701
Note: OBT is open beta, MP is Android 10
OBT to MP rollback guide—via Local OTA update
Note: This upgrade method will erase all the contents of the phone, please be sure to backup first
1. Download the latest ROM upgrade zip package from the specified server
2. Copy the Rollback package to the phone's internal storage, and remove the '.jar' file name extension if present so that the file ends in '.zip'
3. Go to Settings -> System -> System Updates -> Click top right icon -> Local upgrade -> Click on the corresponding installation package -> upgrade -> System upgrade completed to 100%
4. After the upgrade is complete, click Restart
5. Update successful
Want to go back to MP? Download the Rollback package from the links below:
Download links for OnePlus 8:
OnePlus 8 NA Version
OnePlus 8 IN Version
OnePlus 8 EU Version
Download links for OnePlus 8 Pro:
OnePlus 8 Pro NA Version
OnePlus 8 Pro IN Version
OnePlus 8 Pro EU VersionClick to expand...