hi,
if you have the SHSH files you can downgrade to the previous vrsions, if not you can get them with one of those (tinyumbrella, redsn0w, ifaith...), imy prefered is tinyumbrella
please i'm looking for SHSH of an 4S idevice if you can find me some files or send me yours i'll be thakful to you
(sorry for my english )
suisspal at hotmail.fr