Oneplus has already released oxygen os 12.1 C.15 update for oneplus 9R few days ago . Download C.15 FOR ONEPLUS 9R HERE
Now oneplus has released small C16 update for oneplus 9R.
[Optimized] the power consumption in some scenarios, improved battery life performance.
Download Links :-
oneplus 9R C.16 – LINK
This is incremental update . you have to be in C.15 to update to C.16. Install it via Local upgrade apk .