Well from my own experience when they released the 11.0.6.8 update for the 8t,it was so bad it ruined the phone so you couldn't watch videos play games or listen to music without it lagging really bad.
Now the problem with this wasn't so much the issues with the update,it was the fact they completely ignored the thousand of complaints and no statement was released by oneplus.at the very least they should of released a statement at the time to say "we are aware of an issue with the update and we are working hard to get this resolved".but we the customer never heard anything until a new update was released.
It was a shame and was one of the reasons I went back to samsung, although the other reason is I just love new phones 🤣.
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