T-Mobile is rolling out the Android 10 OS update to the OnePlus 6T. This is a fresh rollout, as it previously postponed the rollout due to some persistent issues with the Android 10 OS.
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The software version of this update is A6013_34_191228 and has a heavy size of around 1.6GB. It also brings the December 2019 security patch.
Android 10 for OnePlus 6T changelog:
Upgraded to Android 10 OS
Android security patch update to December 2019
Improved system stability and general bug fixes