Corium , via OnePlus 9 Pro , Jul 5, 2021 : I had some issues during the Update. It helped to wipe the Cache and did not loose my data. Never had Problems with Updates until now.
Caomhin , via OnePlus 9 Pro , Jul 5, 2021 : Turn off the phone completely, plug it in for 30 minutes to ensure there is enough charge. Then turn it back on as normal and check if it boots properly
Helder_DAlmeida , via OnePlus 9 Pro , Jul 6, 2021 : Can you explain a little bit more about the situation? How was your battery 🔋?
Corium , via OnePlus 9 Pro , Jul 6, 2021 : Battery was fine. Rebooting did not help. Though emptying Cache helped, it told me, that I would need to type my Gmail Account in, but I did not have to.