How to Jailbreak Your iPhone 3GS Using PwnageTool (Mac) [4.2.1]

Here are the instructions that has to be followed in-order to jailbreak your iPhone 3GS on iOS 4.2.1 while working on PwnageTool for Mac. Step 1. Here, in-order to follow this steps, you are require to have 4.2.1 iPhone firmware. 4.2.1 (3GS): iPhone2,1_4.2.1_8C148a_Restore.ipsw Step 2. Now you double click to run PwnageTool and then drag…