Greenpois0n RC5 Released! Untethered iOS 4.2.1 Jailbreak

Update #4: No more waiting for the Windows version, folks! Windows version of Greenpois0n RC5b2 has been released! Same drill, this is beta, there will be bugs and whatnot. Use at your own risk. In addition, Chronic Dev Team have updated Greenpois0n to RC5 beta 3 — Instructions below and downloads below. Enjoy!

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Update #3: Chronic Dev Team has released an updated and more stable build of Greenpois0n RC5 — Greenpois0n RC5.2 — This should fix some issues for some. If you’re having issues, I suggest you try this version. Please, keep in mind that this is still beta, there will be bugs. Also, this is still for Mac OS X only. Install a Mac OS X distro such as Kalyway to use if you’re on Windows and can’t wait.

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Update #2: Chronic Dev Team has released the README:

Supported iDevices:

• iPod Touch 2G (all bootroms)
• iPod Touch 3G
• iPod Touch 4G
• iPad 1G
• iPhone 3Gs (all bootroms)
• iPhone 4
• iPhone 4 Verizon (_not_tested_)
• AppleTV 2

Instructions:

1. plug the device to your computer using the USB cable
2. quit iTunes if it shows up
3. start greenpois0n.app
4. follow instructions
5. the device will boot a 1st time with verbose text on screen. This operation will install the jailbreak on the device.
6. the device will reboot normally
7. start the Loader application (green icon on the SpringBoard), and follow instructions to install Cydia

Please read the entire README here

In addition, there seems to be a temporary fix if greenpois0n doesn’t work the first time; that is, hold the Home button while jailbreaking. Apparently, that’ll make the jailbreak work. I can’t confirm this.

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Update: I can confirm this working via an updated (not clean restored) iPhone 4. However, It takes a great deal of patience. It’s still a beta, so there are kinks to get worked out. In addition, the Windows version should be released in a week or so. — Patience is a virtue, my friend.

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Hell yeah! Just released is the much anticipated and long awaited untethered iOS 4.2.1 jailbreak by Chronic Dev Team — Greenpois0n RC5. As reported a few days ago, Apple closed the loophole hackers have been using up until iOS 4.3 to jailbreak.

Since it’s closed, there was no need to wait till Apple released the update, so Chronic Dev Team decided to release Greenpois0n RC5, providing a way for users to jailbeak iOS 4.2.1, untethered. This, apparently, works on all devices.

For now, this is a Mac OS X only release. Windows and Linux should be released very soon. Remember, this is an RC, so there may be random crashes and whatnot. Use, strictly, at your own risk!

Greenpois0n RC5Download it here