Hi, this is my first posting since joined to this forum 2010 
My brother sent me an Ipad 1 wifi to upgrade to OS 5.1.1
Current os is 4.2.1 JB with Greepoison RC5, I think I was made mistake to do Reset All Setting, Ipad just restart and stuck on apple Logo.
First I download IPSW (5.1.1) and trying to restore in DFU mode, but Itunes said firmware is corrupted, redownload it 2 times, but getting same result.
so I download ver 5.0.1. download is success but Upgrade always fail, itunes keep give some error (3194, 3014, 16xx),
I just following all possible instruction like editing HOSTS, changing 3 USB Cable, using 3 PC, using any tools like TU, iReb, redsn0w, greepois0n,etc but still have no luck
really desperate with this situation, help please to get a solution. what should I to do ?

My brother sent me an Ipad 1 wifi to upgrade to OS 5.1.1
Current os is 4.2.1 JB with Greepoison RC5, I think I was made mistake to do Reset All Setting, Ipad just restart and stuck on apple Logo.
First I download IPSW (5.1.1) and trying to restore in DFU mode, but Itunes said firmware is corrupted, redownload it 2 times, but getting same result.
so I download ver 5.0.1. download is success but Upgrade always fail, itunes keep give some error (3194, 3014, 16xx),
I just following all possible instruction like editing HOSTS, changing 3 USB Cable, using 3 PC, using any tools like TU, iReb, redsn0w, greepois0n,etc but still have no luck

really desperate with this situation, help please to get a solution. what should I to do ?