hudl 1 demo mode

[Torry46]

hi,
i have purchased a Hudl 1 from the clearance section Tesco. I turned it on and found that the tablet is in Demo mode(not safe mode). i cannot do anything with it, if I try it shows a message Restricted access in demo mode. does anyone know how to turn this off or have instructions of how to put a new stock firmware on it.

thanks
Torry