Hey everyone, i have a iPad 2 (wifi)on 4.3.3 jailbroken using the old Jailbreakme.com 3.0 and want to upgrade it to ios 5.1.1/5.0.1. First, I have downloaded the right IPSW file (iPad2,1..._Restore.ipsw). secondly, i have literally no Security apps installed on both tested computers aside from windows firewall (Which I disabled). Third, I have a clean hostfile on both computers, and have tinyumbrella unchecked(it was grayed out) on the pc, on the laptop, I didn't install TU. I even tried Stitching my blob in the ipsw but i still get errors. I Get error 21 when in recovery mode and 1600 in DFU mode. Please dont post replies like "disable the setting in TU" and "delete the line in the hostfile" because i have been doing that for the past 5 hours on 2 different computers. Thanks.