OnePlus 5t in why not os 11 update ?
Because, it's not released yet and still in beta on most devices.
Not even google pixel devices have a official android 11 port yet.
The 5 Series Devices have already reached their end of device support cycle so there would be no further Android updates for 5 series devices. You may try a custom rom if you wish to continue with the same device or upgrade to a newer device for Android updates. Thread Closed.
The Lab Reviews- Everything you need to know on OnePlus 8T
by Leo X., 2020-10-26