When is the OXYGEN OS 11 coming to Oneplus 7T ?!
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Android 11 is still under development by Google. Once Google releases it, OnePlus will start working on a version of Oxygen OS based on it.
There is no ETA.
Please read and use this thread for further discussion
[Officiel] Android 11 Beta (Developper Preview) pour la série OP8
by Horsault, 2020-06-19