Supported Devices:
* iPhone 3GS
* iPhone 4
* iPad
* iPod Touch 2G
* iPod Touch 3G
* iPod Touch 4G
1. Make sure you are running iOS 4.2.1 and download GreenPois0n RC5 tool.
2. Install and launch GreenPois0n RC5. Connect your iDevice to computer and click ‘Prepare to Jailbreak (DFU)’.
3. Enter DFU mode by following on-screen instructions.
4. Now click ‘Jailbreak’ on the tool to jailbreak your iDevice.
5. After the process is over, start ‘Loader’ on the homescreen and install Cydia.
That's it! Congratulations.
Note: if loader can't install cydia.
FOR MAC ONLY
Working for iphone 4 for that you need to as follows.
First have to use GreenPois0n RC5 to JB this proces is just to get CYDIA on springboard after JB in case of Loader not working.
1. Download redsn0w 0.9.7b6
2. Download the stock 4.2.1 .ipsw file for your device
3. Execute redsn0w and select your .ipsw.
4. Here be careful while selecting options
5. Run redsn0w with "Install Cydia" checked, and JailbreakMonte unchecked.
This will install cydia while preserving the Grenpoison JB untouched :)
As promised by the Chronic Dev Team hackers, finally the GreenPois0n RC5 iOS 4.2.1 untethered jailbreak is available now. This jailbreak works on Mac,Windows and Linux too (Update: Works on Mac only as of now). With this tool you can untether jailbreak your iDevices including iPhone 4, iPhone 3GS, iPod touch 4G, iPod touch 3G and iPad running on iOS 4.2.1.
This GreenPois0n RC5 jailbreak tool supports animated custom boot logos which is pretty new feature that lets you custom set an awesome logo . Also with GreenPois0n RC5 you can jailbreak the aforementioned iDevices without using SHSH blobs for iOS 4.2b3.
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