I didn’t find a thread with info about that WRVacuum firmware version.
Here is the thread where they released that Firmware version for the Hub:
There weren’t any other reports about the hub having problems so it could be useful if you are willing to report there that your hub had issues after updating to that firmware version. We might be able to see if anyone else can replicate that or narrow it down in some way.
I didn’t even think about the USB port being used to flash other devices like these. Thanks for mentioning it. That is a good idea. If you create a Wishlist post asking Wyze to start allowing us to flash firmware into other devices like these through the USB port, I will vote for it too.