How to downgrade iOS 4.3 firmware & 4.2.1 to iOS 4.2.1 or 4.1 on your iPhone , iPod Touch or iPad. This will work on both Windows and Mac. This will downgrade iOS 4.3 , 4.2.1 , 4.1 , 4.0.2 , 4.0.1 and 4.0, only if you have the SHSH file of the firmware you want downgrade to backed up into Cydia. – Copy and paste the following IP address into your “hosts” file : 74.208.105.171 gs.apple.com – Link to download all firmwares for your iDevice : www.felixbruns.de If you get an iTunes error in the middle of the iTunes restore, download TinyUmbrella, and Click “Kick My Device Out Of Recovery” / “Exit Recovery”. – Download TinyUmbrella : goo.gl Windows hosts file location : C:\windows\system32\drivers\etc\ Extra tags: Jailbreak Unlock iPhone 4g iPod Touch Jailbreakme Jailbreakme.com firmware spirit ios4 3g 3gs ipodtouch 2.0 4.0.1 iphone iphone4 legal iOS 4.0 free ipad 2g 1g all cydia ipod iphone cell phone electronics easy way to install download jailbreakme jailbreak me how touch 2g 1g 3g 3rd 2nd 1sr gen generation 3gs jailbreakme.com electronics iphone phone cell cellular at&t unlock carrier greenpoison snowbreeze redsnow limera1n baseband new free update updated October 2010 download here greenpois0n how to jailbreak 4.1 firmware iphone4 iphone 3gs 3g 2g ipod touch 4th 3rd 2nd 1st gen generation ipadwifi mc model limera1n jailbreakme 4.0.2 4.0.1 4.0 3.1.3 3.2.2 carrier unlock ultrasn0w 02.10.04 cydia itouch easy fastwindows mac untethered hacktivate ios4 ios ios4.1 update …