Upgrade my iphone 4 to ios 7.02, can't sync , asking for authorize

just upgrade my iphone 4 to ios 7.. and the problem is i can't sync my iphone to itunes now and the reason always "authorize the computer".. already done it several times (authorize > deauthorize > authorize) still can't sync. anyone can help me? thx

some additional info: i getting one of my apps from my friends itunes..
is there any affection that happen from doing that?
if so.. maybe i need to deauthorize his computer 1st?
thx

Similar Messages

Maybe you are looking for