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I Didnt have any log. This update is so much broken that i reflashed 9.5.30. Also Screen recorder bug i reported by Feedback section still didnt get any respond (only by you on forum)
I see. But sending bug reports with proper logs is one reason why Beta ROMs are made available to the public. We, as users, are meant to send feedback to those small issues that weren't found by the Beta Team. Since you downgraded, nevermind. I'll discuss with the team anyways and see if gets some results.
Also, about the screen recorder bug, I haven't heard anything about it either. I wouldn't expect much since Global Beta will not be available from July 1, 2019. So I wouldn't expcet much changes with the Beta versions in coming weeks too. You can read the Admin's thread in the homepage to know more about it.
is there a way to downgrade from 9.6.13 to 9.4.26 without unlocking the bootloader?
Not recommended. 9.6.13 to 9.4.26 has many builds in between. Hence, unlock bootloader and flash 9.4.26 fastboot ROM via Mi Flash tool. But I'd suggest you to wait for this week's update that should be released today. See how it goes.