How to jailbreak iOS 4.2.1 with Redsn0w

[RedZot]

After the release of IOS 4.2.1 (not 4.2), the news comes unlocked and jailbreak. The Dev Team has released a new post on his blog to make an initial focus on the subject.

Jailbreak

Initially, the Dev Team reminds those who want an unlocked to stay out of this update, because the base band is updated. Subsequently, the good news is for owners of iPhone 3G, iPhone 3G and iPod Touch 2G MB (Non-TM). Thanks to the various functional and exploits previously found on these iDevice, you'll have a jailbreak 4.2.1 iOS untethered.

For newer models, iPhone 3G (new boot ROM), 4 iPhone, iPod Touch 2G ™, iPod 3G, iPod 4G and Touch iPad , the news is still good. With the achievement of Geohot used as a tool to jailbreak iOS Limera1n 4.1, the latest generation of devices can be jailbroken. Now it gets stuck on the side untethered. Indeed, now the jailbreak on these iDevice is tethered, that is to say that each device reboot a computer is needed to re-jailbreak to be functional. But all is not lost. Comex is working hard to make the 4.2.1 jailbreak iOS untethered. However SHSH of iOS 4.1 will be required. If you have not saved, it could be jammed. While the Dev Team would be an alternative but still using the SHSH iOS 4.1.

When will then exit? Not right away, but it beforehand. There are still some last minute problems like fixing a bug with the patch or Mobile Substrate Comex in the Kernel. But the team is on the spot and works to repair these problems.

• Download the Latest Version of Redsn0w
• Download the iOS update 4.2.1 via iTunes
• Update the iPod, iPad or iPhone with the iOS 4.2.1 via iTunes
• Restart the device without disconnecting from computer
• Run the RedSn0w
• Select iOS 4.2.1 firmware from “Library / iTunes / iPhone Software Updates”
• Click Next
• Follow the instruction to perform Jailbreak

[racer]

It just out of the new version that comes so RedSn0w to 0.9.6b4. This is available for all Apple devices, the new stages are redsn0w the jailbreak of 4.2.1 Device with iOS tethered and untethered whichever device they hold.

Note:

Untethered: You will be able to jailbreak in MODL untethered only the iPhone 3G, older iPhone 3Gs and iPod Touch non-MC.

Tethered: All other devices

What you need:

• iOS 4.2.1. firmware update
• RedSn0w Mac 0.9.6b4 or 0.9.6b4 RedSn0w for Windows
• iTunes with the latest update to 10.1.

Jailbreak

1. Upgrade your device with iTunes to firmware 4.2.1 just downloaded.
   
   
   • Connect your iPhone, iPod to your Mac or PC
   • Run the program
   • Once prompted, select the file. Firmware iOS of 4.2.1 that you used to upgrade your device.
   
   
2. Now select "Install Cydia "and click" Next. " Bring the device in DFU mode when the system will start and install the jailbreak.
   
3. When the program start in DFU follow the onscreen instructions and your device will be properly jailbreak in seconds.
   
4. Finished. In cases where you have a tethered jailbreak, Redsn0w will warn you.
   
5. The guide is very similar to earlier versions only makes a difference if you have a device to be unlocked in a tethered or untethered.