Download iOS 4.3.1 Custom Firmware IPSW Untethered For iPhone 4, 3GS, iPad, iPod

Important notes:

If you have already installed iOS 4.3.1 on your device just use Redsn0w Click Here.
If you have tethered jailbreak on your device, you can use Redsn0w to make your device untethered.
If you run iBooty for Windows so you have to use Redsn0w for Windows and the same on Mac.
You should use custom ipsw if you want to keep your lower baseband on iOS 4.3.1.
If you rely on ultrasn0w unlock you MUST stay away from upgrading
to iOS 4.3.1 untill dev-team upgrade ultrasn0w to work on iOS 4.3.1 on
the unlockable basebands

iPhone 4

Download iPhone 4 iOS 4.3.1 Custom ipsw untethered - Activated ( for users who are not on official carrier SIM card)
Dwonload iPhone 4 iOS 4.3.1 Custom ipsw untethered - Unactivated (for users who are on official carrier SIM card)

iPhone 3GS

Download iPhone 3GS iOS 4.3.1 Custom ipsw untethered - Activated ( for users who are not on official carrier SIM card)
Download iPhone 3GS iOS 4.3.1 Custom ipsw untethered - unactivated (for users who are on official carrier SIM card)

iPad 1 (first generation)

iPod Touch 4G:

iPod Touch 3G:
Download iPod Touch 3G iOS 4.3.1 Custom ipsw untethered