But, bad news is: T-Mobile did not send out stable OneUI 4 update to factory unlocked N986U1. So you'll either have to wait for that, or swap sim card to other carrier to temporarily switch CSC, then receive the update.
Not everyone has access to a computer the smartswitch thing needs to have alternate ways
Hello @Yamialex224 ,
We wouldn't recommend switching out carrier SIM or downgrading to Android 11 as both of them would involve erasing all your data on the device. Please be patient for a few more days and we will provide official update.
One UI Beta Team