Hi 19452023,
Thanks for posting this on our forums, I am sorry you were having issues with your set top box after installing a new Hub!
Do you still need help with this issue?
If yes, I can see that @newapollo & @japitts have already given you some help in explaining what to do, lets go over their posts one more time
So like @Ernie_C stated, when you install a new Hub it will also mean that you'll need to connect this up manually on your set top box - New Hub means a new Hub name & password! Your current TV box will still have the old Hub's name & password stored on it.
To connect your TV box to the new Hub, follow Japitts advice by going through the TV box settings - Home > Help & Settings > Settings > Network - This will allow you to choose the new Hub's name and input the new password for the WIFI.
If you need more help with connecting devices to your new Hub, I have a really helpful link here: How to Connect.
Please let us know how you get on!
Thanks,
Megan_L