Chronic Dev Team has released Greenpois0n 1.0 RC5, an update to their jailbreak utility which, in its current state, can effectively provide an untethered jailbreak to iOS 4.2.1 devices. The jailbreak tool also does not require developer saved SHSH blobs of 4.2b3.
How To Jailbreak iOS 4.2.1
- Backup your iPhone / iPod touch / iPad using iTunes, just in case anything goes wrong and you need to restore your firmware to a stock IPSW.
- Download GreenPois0n 1.0 RC5 from Chronic Dev.
- Connect iOS device to your computer.
- Launch GreenPois0n and click on “Jailbreak”.
- Follow the onscreen instructions and proceed to timely press the buttons on your iOS device as instructed:
- Press and hold sleep button for 2 seconds;
- Continue holding sleep, press and hold home button for 10 seconds;
- Release sleep button, continue holding home button. - With your iOS device now in DFU mode (or so it should be at this point), click on the “jailbreak” button. Now Greenpois0n will inject its ‘poison’ in your iOS device, jailbreaking it.
- Allow your iDevice to reboot. At this point, you are already jailbroken.
- Once your device is up and running again, you can install Cydia by tapping on the “Loader” icon which should be present on one of your home screens.
That’s it!
This guide is for Mac OS X users only but same steps should apply for Windows and Linux users when Greenpois0n 1.0 RC5 becomes available for those platforms as well.
Disclaimer:- This article has a purely informational purpose and doesn't, in any way, suggest that you should hack your Apple device.
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