i have a iphone 3G and im trying to use a custom firmware, but everytime i try to custom restore in itunes by clicking alt/restore it doesnt work. ive tried both alt buttons and there is no box that lets me choose my firmware. im running itunes 10.5.2 on snowleopard. (ive tried downgrading as far back as itunes 7.5 and still the same thing) please help, im going crazy