Turbofotografas , via OnePlus 6 , Oct 14, 2019 : Hello, I'm just upgraded from oxygen 9.0.9 to Hydrogen Betab30 (Android 10). But I can't downgrade to Oxygen from local system update. I want downgrade, because 4G network issuses and can't login to OnePlus Cloud account (China Version maby ) There is another way without PC do do that.Because my Windows 10/PC can't see Qualcom drivers on fastboot mode? Maby wait oxygen Android 10 version and I upgrade without issues? Thank You!