Guys, try to be patient when you get to the black screen. I did ponder whether it crashed as well when I got to this point, but after 5 to 10 minutes of leaving do its stuff, the box rebooted successfully.
So my advice would be to give it some time, as power cycling/rebooting might do more harm than good.
Of course, if it has been going on for an hour or so, I don't expect that's normal.
IIRC, the update was dated 23/09, so if there's a public beta V007 dated 20210824, then personally I'd rather flash back to 006A and then let FOTA bring it back to the official v007.
So my advice would be to give it some time, as power cycling/rebooting might do more harm than good.
Of course, if it has been going on for an hour or so, I don't expect that's normal.
IIRC, the update was dated 23/09, so if there's a public beta V007 dated 20210824, then personally I'd rather flash back to 006A and then let FOTA bring it back to the official v007.