After getting the OxygenOS 13 Open Beta, OnePlus has now started releasing the OxygenOS 12 C.65 build for the OnePlus 9 and 9 Pro smartphone users.
This new update brings the most to date September 2022 Android security patch to enhance the overall system security and fixes some important bugs.
Additionally, it may include general device performance and stability improvements to deliver a secure interface and improve the user experience.
The OxygenOS 12 C.65 update is currently available in Indian markets for the OnePlus 9 series devices and more territories will soon receive this update.
Source — OnePlus Community