Hello there... Here's a copy of the email to my son this morning, 15-08-2021:
Morning - gave up on the new mode 3.0l - tried it without the 6db a t t e n u a t o r - still no joy - I think it just stalled at the point where it stated 'down loading'??? What a waste of time and effort!
Fortunately when I switched on the old one - it worked straight away - it did display a tab in Firefox requesting the log in to a Super Hub - I didn't know whether that referred to the old or new one and just ignored it - everything seems fine (as younger people say!)
Imagine having a new TV that wasn't turnkey?! The hub should step through with clear diagnostics - perhaps requesting to first install a 'naked form of browser' using the old router - without the restrictions of Firefox or similar???
Goodness knows how a technophobe would manage???
Phew!
Have a nice day
Dad

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Note I used to instruct aircraft avionic suit s/w written in assembler & my son writes second line authentication s/w for mobile phones - we are not exactly technophobes!.