OnePlus does not forget about its "oldies" OnePlus 6 / 6T and continues to update them.
What is known
Chinese
the manufacturer has released a new one for smartphonessoftware version. The firmware received build number OxygenOS 11.1.1.1 and weighs more than 2 GB. The system has such a large volume because the developers decided to “rebuild” the OS. As for the list of changes, the September security patch was installed in the software, power consumption was improved, and the sensitivity of the gyroscopic sensor was edited.
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When to expect
The update, as usual, is being rolled out to smartphones in waves. If you don't want to wait for your turn, then the system can be downloaded through the Oxygen Updater application and installed manually.
Source: OnePlus Forum