The affected firmware is 8.5.2 GA (8.5.2-build5581). I just added the build number for the B20x 8.5.2 GA firmware in the announcement post and this should clear the doubt
Please arrange to upgrade your device using 8.5.2s067
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I have a few B20x’s that were 100% reliable and after upgrading to 8.5.2 Build 5581, I had to revert back to 8.5.1. I support my grown children and couldn’t hav them rebooting so I immediately reverted and was waiting for the fix until trying again.
I could do a hard reboot, and then the Web UI was alive to roll back to 8.5.1.