When you download the file with IE (Internet Explorer), it has a zip extension.
You need to change that to .ipsw
(ATTENTION: the right extension is IPSW not ispw !!)
Don’t unzip it. Just change the extension (rename the .zip file in .ipsw).
On a Mac if you read “xxxx.ipsw.zip” delete .zip !
If you don’t want to change the file type to .ipsw, just use different browser such Firefox or Safari from Apple.
Good luck !!

Download iOS 5.1.1 ipsw firmware :


Download iOS 5.1 :


Download iOS 5.0.1


Download iOS 5.0


Download iOS 4.3.5


Download iOS 4.3.4


Download iOS 4.3.3


Download iOS 4.3.2


Download iOS 4.3.1


Download iOS 4.3.0


Download iOS 4.2.1


Download iOS 4.1


Download iOS 4.0.2


Download iOS 4.0.1


Download iOS 4.0


First: iPod Firmwares


Second: iPhone / iPod touch / iPad