Hi Neil,
The 'Web Upgrade' option is not in the WebUI, rather this is accessed from the menu set on the BB1 itself.
So, power up your BB1. When you see the 'Brennan' message and then the time displayed, press the large knob down once and you should see 'Main Menu'.
Then rotate the knob until 'Settings & Tools' is highlighted and click the knob on that option. In 'Settings & Tools' window, highlight and click on 'Maintenance'.
Then rotate the knob until you find 'Web Upgrade' (it has to be scrolled down to as it is off screen initially)
That's it, and you should be fully upgraded to 'Version BB1 Jul 21 2020'.
You BB1 software is very out of date, and many updates have been made to YouTube since then, so the new version should fix your problems.
Regards,
Peter.