If hes had it for less then 6 months, i think he can get it reset for free by S.C..... going by what Wigit did for me what i bought his old Bluefin handset.
Buying it for £200 as a reset handset is worth it, but not if hes not prepaired to pay the cost to reset it, if its older then 6 months.(not sure on timescale tbh, might be 1 year )