Greenpois0n RC5 jailbreak tool by the Chronic Dev Team allows you to do an untethered jailbreak on iPhone 4/3G/3GS, iPad, iPod Touch 3G/4G. Here is a complete HOW TO STEP BY STEP GUIDE to use Greenpois0n 4.2.1 RC5 on iPhone 3GS & iPhone 4 on MAC OS X.
Those who have used UltraSnow unlock tool previously, DO NOT update to iOS 4.2.1, other wise it will result in a locked device.
STEP BY STEP HOW TO GUIDE TO USE GREENPOISON RC5 TO DO AN UNTETHERED iOS 4.2.1 JAILBREAK On iPhone 4 & iPhone 3GS
STEP 1: Download Greenpois0n RC5_2
STEP 2: Save the downloaded file on your desktop and unzip it.
STEP 3: Open the folder that you have unzipped and launch Greenpois0n by clicking on it
STEP 4: Connect your iPhone 4 or iPhone 3GS to the computer. switch off the power and click on the big Jailbreak button.
STEP 5: Greenpois0n tool will show you how to put your iPhone 4/iPhone 3GS into the DFU Mode.
STEP 6: You will be asked to press and hold the sleep button for 3 seconds.
STEP 7: Keep on holding the sleep button and press and hold the home button for 10 seconds.
STEP 8 : Now let go the sleep button but keep holding home button for almost 15 seconds.
STEP 9: Let the jailbreak process begin as your device is in the DFU mode.
STEP 10: The rest of the process will be done by the Greenpois0n tool. After its finished click on the Quit button.
STEP 11: After your iPhone 4/ iPhone 3GS restarts, a new Loader on the Springboard will appear with the name “Greenposi0n”. Click on the to launch it.
STEP 9: Select Cydia and click on the Install Cydia button and let the Cydia to be installed.
STEP 10: It will prompt you whether you want to remove the Loader app from your device. Click on the remove button go to home. It will now make your device to restart itself.
CONGRATULATIONS!! You have successfully jailbroken your iPhone 4/ iPhone 3GS running iOS 4.2.1 on MAC OS X.
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