OnePlus 9RT is officially getting the Android 13 based OxygenOS 13 in India. The update rollout was announced by the company via a post in the community forum. It updates the firmware version to IN: MT2111_11.F.11. OnePlus says that the stable OxygenOS 13 will initially be available to users who participated in the Open Beta versions. It will be gradually pushed to more users over the next few days.