Transferring 'Ownership' of Tire Systems

Hi I bought 2 fobo Tire sets from a garage closure but when trying to connect get a message that "This In-car unit already owned by another user" on both sets. Neither shows any sign of use (the sensors certainly haven't been used) although the boxes are open so it's possible they were used for demo purposes by the garage. Is it possible to 'reset' the ownership in any way? Thanks in advance.