Those who upgraded their device to iOS version 4.2.1 or 4.3 [via developers ipsw] can now downgrade the iOS using the tutorial below , [only] if they have saved the SHSH Blobs for their previous firmware via TinyUmbrella. The following video tutorial will explain the complete step by step process to downgrade your iphone ipod touch 4 and ipad to older firmware for which the SHSH Blobs have been saved .
Current iOS 4.3 4.2.1 Firmware offer only tethered jailbreak via RedSn0w 09.06.b4 Jailbreak Tool on Mac . With the downgrade you can jailbreak your device on GreenPoison & Limera1n Tethered on iOS 4.1 . You can also follow the step-by-step downgrade guide for the video tutorial here .
Useful Links :
- TinyUmbrella for Windows and Mac
- iOS 4.1 .ipsw file for iPhone 4 3GS 3G iPod Touch 2G 3G 4G
- iTunes 10.1
iPhone 4.2 – 4.3 Downgrade to 4.1 video – YouTube :
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