iphone 4 stuck while upgrading

iphone 4 stuck while upgrading
location: modmyi.com - date: February 12, 2011
hi, hi have iphone 4 with ios 4.1 jailbroken and i want to upgrade to ios 4.2.1 with no succes.. i have tried to downgrade to 4.1 and to 4.0.1 and always he stucke at the same position... i connect to itunes and he start to restoring and itunes get stucked almost on finish. the iphone 4 stays stucked in 2/3 of stage.. it stays like that for hours, only way to get out is reseting the phone but when i upgrade again it give me the same thing. itunes does not give any error, just stay like the image.. i have tried in 2 diferent computers, one with windows xp and other with windows 7, same problem on both... i have done this with tyniumbrella open and closed and always the same problem.. can someone help me?
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