I'm currently at my wits end with this router, there is a BT forum post with over 47 pages of replies just saying to turn it off, factory reset etc and it eventually starts to unlock for people. I've factory reset about 6 times, left it off for over 30 mins and had no luck. Also called BT fault team and they claim nobody has ever heard of this issue, including their second line people which literally cannot be true.
Has anyone else had this problem and been able to fix it? Not really wanting to buy a new router if possible.