How To Jailbreak iOS 4.2.1 (Redsn0w 0.9.6b4)(Windows & Mac)iPhone(4g,3gs),iPad (1G),iTouch (2g,3g)
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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).
NOTE: Those of you who rely on a carrier unlock MUST STAY AWAY
from Redsn0w and iOS 4.2.1.
Redsn0w 0.9.6b4 (Windows only):
Redsn0w 0.9.6b4 (Mac only):
Follow the step by step instructions posted below to jailbreak iOS
4.2.1 with Redsn0w 0.9.6b4:
Step 1: Download iOS 4.2.1 for your version of iOS device.
Step 2: Update/Restore to iOS 4.2.1 firmware using the IPSW file
you just downloaded via iTunes 10.1.
Step 3: Start Redsn0w 0.9.6b4 and point it to iOS 4.2.1 firmware
to proceed with the jailbreak.
Step 4: Now select "Install Cydia" and click "Next". Optionally
(if available), you can also select any other option you like.
Step 5: Now make sure your device is both OFF and PLUGGED IN to
the computer before you click "Next".
At this stage you will be presented with a screen where you will
have to quickly hold "Power" button and then while holding the
"Power" button, you will now have to hold "Home" button too. Now
after few seconds release "Power" button but keep holding "Home"
button until installation begins.
Step 6: Sit back and enjoy while redsn0w will do all the rest for
you. Once done, your iPhone or iPod touch will restart
automatically and you will find it jailbroken on the latest iOS