Oneplus’ OxygenOS 12 is a contentious update. As a result, it took a long time and a lot of Closed Beta testing to get solid builds out. Because of difficulties or errors, Oneplus sometimes pauses the update or removes the download links. As a result, some OxygenOS 11 stable users did not receive OTA upgrades. Additionally, some customers that downgraded to OxygenOS 11 utilising Msm unbrick or Rollback packages are missing out on OTA updates.

oxygenos 11 to oxygenos 12

As a result, we’ve provided the files and instructions for updating your OnePlus Smartphones from OxygenOS 11 to OxygenOS 12 Stable. Also read, Oneplus 10 Pro receives OxygenOS 12.1 A.15 Hotfix Update with May Security Patch

Prerequisite to Install OxygenOS 12.1 on Oneplus 8, 8 Pro, 8T & 9R

OxygenOS 12 Builds

Oneplus 8
  • Oneplus 8 first open beta C.10: Global & India (Full Zips)
  • Oneplus 8 OxygenOS 12 C.17: Use the OxygenOS updater application (Incremental files) Download
  • Oneplus 8 OxygenOS 12.1 C.20: Use the OxygenOS updater application (Incremental files) Download
Oneplus 8 Pro
  • Oneplus 8 Pro first open beta C.10: Global & India (Full Zips)
  • Oneplus 8 pro-OxygenOS 12 C.17: Use the OxygenOS updater application (Incremental files) Download
  • Oneplus 8 pro-OxygenOS 12.1 C.20: Use the OxygenOS updater application (Incremental files) Download
Oneplus 8T
  • Oneplus 8T first open beta: Global & India (Full Zips)
  • Oneplus 8T OxygenOS 12: Use the OxygenOS updater application (Incremental files) Download
  • Oneplus 8T OxygenOS 12.1: Use the OxygenOS updater application (Incremental files) Download
Oneplus 9R 
  • Oneplus 9R first open beta: India (Full Zips)
  • Oneplus 9R OxygenOS 12: Use the OxygenOS updater application (Incremental files) Download
  • Oneplus 9R OxygenOS 12.1: Use the OxygenOS updater application (Incremental files) Download
If you wish to go back to OxygenOS 11, you can use RollBack Packages to do so at any moment. Take a look at this Rollback Packages and Procedures article.
You can refer this YouTube Video as well:

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