Channel locked


The Dumb One
My friend (honest, not I) has 'locked' BBC iPlayer (ch 901) on his Hummy (padlock symbol). All other channels are ok, including ITV Player. He seems to have inadvertently set a password somehow, probably by poking buttons when half asleep. (his words).
He can't do a factory reset as it obviously asks for the password. He has tried the default 0000 and random 1234 etc. but cannot unlock it. He hasn't got the custom S/W installed.
Any ideas on how I can help him sort it please?

Ok. I've found the reset in the hidden menu.