stuck on ios 6.0.1 update with apple logo offside the screen

hi felle's i recently recieved a damaged one,with the known error of 1394 anyhow after resolving this and bypassing surtain issue SUCH as recovery loops ,and not entering dfu mode correctly !!!! have managed to reach to the point of updating to ios 6 ,but it always gets stuck in the middle with the apple logo playing every few minutes from the middle to the right side (i think its gpu related-perheps) so any advice from you schollers here ? )