You wouldn't have been able to do it by accident, and it is not done on the hub.
Factory reset the hub and then switch Smart Setup again, the hub may be new but that doesn't mean it's above suspicion
Is it the devices with a static IP connection that are not working?
TalkTalk default gateway is 192.168.1.1, BT use 192.168.1.254
But that would need to be set on the devices though.
Yeah but that makes it easier to fix. Just forget network connection on the device and go for a new DHCP address
True
If it is the devices with static IP that you are having a problem with then you will need to dig out the user manual for each of those devices as the changes need to be made on them.
As a rule of thumb, if one of the devices is a TV, you will proceed as below
Enter Setup, Find Network Settings, Tell it to forget whatever settings it's currently using & go for an automatically assigned (DHCP) address. Sorry but that's the downside of Static IP, it requires a measure of technical know how when things go wrong as different devices do the same thing in different ways
still no joy ive done a factory reset still no joy ive changed the ethernet cable plugged it in and it worked but as soon as i connected something else to the hub it dropped the connection for upstairs agian im beggining to wonder if this was a bad move moving to bt i never had this problem when i was with talktalk