Since it is the Beta that caused this, and because there have already been other reports of the same, please go to the Beta Feedback Thread and report your experience. It is important that the Wyze Devs hear about these issues in the Beta release. They won’t be monitoring out here in the open forum. That’s why it is important that all feedback go thru that thread.
As for the flashback, there are two .10 varieties available for flash as well as a .9 flavor. Make sure it is a blank 32GB FAT32 SD Card used to copy the .bin and that it is renamed appropriately if necessary. I also recommend a factory reset with no SD Card prior to flashing.