I did the factory reset yesterday with button down and power, the update screen bug is gone, now the UI 3.0 version is displayed correctly. At the moment the bugs present after the ota update seem to be gone.
That is really great!! Mine is at service centre.. I've started experiencing bootloops, and I couldn't recover it.. I'm really happy that the recovery mode factory reset does a better job!
Yes, at the first start it did not work ok google, I deactivated voice match and restarted, I reactivated voice match and ok google worked perfectly. AOD has always worked instead.