HomePod refuses to log on to WIFI

I have a HomePod (Model A1639) and two minis (latest models) - the master is one of the minis. Just after installing iOS 26.2 I had problems with SIRI! Not unusual at all! However I traced the problem to the HomePod by isolating equipments. Apple HOME now works better with the HomePod not connected.

I understand I cannot go backwards uninstalling IOS on the HomePod. So, I tried resetting it via HOME, nothing so I tried a manual reset - nothing. Tried a factory reset and afterwards it would not log on to my WIFI. I have tried everything on the Apple website to get the HomePod to log on to WIFI - nothing works and of course, with no WIFI connection I cannot use it or update it!

Would appreciate help please, Happy New Year.