Rollback from OxygenOS Open Beta 11 to 9.0.3
As per my previous post, I have used the Open Beta version for quite sometimes. After few months struggling with battery performance, auto-restart issue and latestly my OxygenOS hangup issue getting worst.
Participating in the Open Beta program is quite good but anyway seeing no worth to being in Beta for quite sometimes and struggling with few issues, I thought I would go back to stable version.
Rollback to stable version doesn't require you to root your phone. There is a rollback firmware that you can flash in the local system update settings. Rollback from Open Beta to the Stable version will require a full data wipe, so keep that in mind before you make the jump.
You may refer to below link to download the package.
https://forums.oneplus.com/threads/oxygenos-9-0-ota-for-the-oneplus-6.909533/
or direct link as below here
This rollback will clear all contents of the phone, please make sure to backup your phone data. After rollback to the stable version of Oreo, you can update to Pie version via OTA (global rollout).