Factory reset on Technicolour 582n and now can't log in

[#1]

My son (honestly) has tried to change the password for our Technicolour router, but mucked up. We can no longer log in. So we thought a factory reset would fix this, but since we have done that we cannot login using the CPXXXXXXXX serial number either. 

[#2]

After your factory reset, when you now open your computer's web browser (e.g. Internet Explorer, Safari or Firefox etc.) what exactly do you see:
a) The Broadband Setup page or
b) The Technicolor Login Screen?

[#3]

good luck with that as i found i had to change over to my brand new personally bought router since i lost internet connection some nights ago and the router simply couldnt take my password etc.