Hi there I own an iphone 3gs, recently a pop up message has been appearing stating activation required on numerous occasions. When I connect it to itunes to restore it keeps switching on and off. I managed to put it in DFU mode, however when I try and restore the phone the following message keeps appearing "iphone could not be restored unknown error (-1)". I kept trying and trying, re installed itunes, tried restoring on a different account but still no luck. Ive went to the apple shop and phoned customer care but they have no clue what to do. Please can anyone help me?