The iPhone Dev Team has just released Redsn0w 0.9.6b4 today which brings first proper jailbreak, with working Cydia and MobileSubstrate for all iOS 4.2.1 devices.
For those of you who don’t know, Redsn0w 0.9.6b4 is based on Geohot’s Limera1n bootrom exploit which has already pwned all current iOS devices for life. The only problem is that it is a tethered jailbreak, which means you will have to boot it into a “jailbroken state” on every reboot.
This so called tethered or semi-tethered jailbreak condition in Redsn0w 0.9.6b4 however only applies to the new devices like: iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G. Old devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model) can be jailbroken-untethered right now using this latest version of Redsn0w.
So until and unless Comex of Spirit and JailbreakMe fame comes up with another untethered hack for iOS 4.2.1, the jailbreak we get for the newer devices will be tethered (or semi-tethered).
Jailbreak IOS 4.2 / 4.2.1 on all devices (including: iPhone 4, 3G, 3GS, iPad, iPod Touch 2nd Gen, 3rd Gen, 4th Gen) using redsnow. This will allow you to install Cydia, enable multi-tasking, wallpapers, battery percentage and more.
Look below to see if your device is a tethered jailbreak: Supported Devices for Untethered Jailbreak: iPhone 3GS Old Bootrom, iPhone 3G
Supported Devices for Tethered Jailbreak: iPhone 4, iPhone 3GS New Bootrom, iPad, iPod Touch 4G, iPod Touch 3G
iPod Touch 2G MC Models NOT SUPPORTED.
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