[Guide] How to jailbreak and unlock the Apple iPhone 4 on iOS 4.0

I have been waiting for a few days now for the official tools to be released by the Dev-Team before I installed the new iOS 4. iOS 4 has been available live via iTunes since the 21st of June. The following guide will show you how to unlock the Apple iPhone 4 on iOS 4.0 using the jailbreaking tools from the Dev-Team 

This process of of Jailbreak requires a Mac and for the Windows Users I recommend waiting until the Dev-Team has updated their relevant tool for Windows.

The Dev-Team has released PwnAgeTool version 4.0 for Mac, Making the tool compatible with iOS4 for iPhone 3GS, iPhone 3G and iPod Touch 2G( Non-MC Model). The tool with create a custom IPSW file which has to be restored onto the device.

Please read these important notes from the Dev-Team blog:

    iPhone 3GS     Summary: Currently, PwnageTool only works on previously jailbroken 3GS devices with the old bootrom.         * If you have a Jailbroken iPhone 3GS with the OLD BOOTROM and you DID NOT use Spirit to jailbreak then you can create the ipsw with PwnageTool 4.0 and restore with your jailbroken recovery mode.         * If you have an iPhone 3GS with the NEW BOOTROM this is NOT supported by PwnageTool 4.0     iPhone 3G         * If you have a Jailbroken iPhone 3G at 3.1.2 (but not jailbroken with Spirit) then you should create the ipsw with PwnageTool 4.0 and restore from recovery mode or DFU mode.         * If you have an out of the box iPhone 3G you should restore using a PwnageTool 4.0 ipsw using DFU mode.         * If you have a Jailbroken 3.1.3 iPhone 3G it is very possible that this can fail from recovery mode, if this failure happens you will need to restore using DFU mode.         * As an alternative to PwnageTool, you can use redsn0w on iPhone 3G (on both Windows and Mac) as mentioned in our last post.     IMPORTANT! Whenever you need to enter DFU mode, you will need to do so using PwnageTool.     iPod touch 2G         * If you have an iPod touch 2G (non-MC model) that is jailbroken (but not with Spirit) then you can restore using recovery mode.         * As an alternative to PwnageTool, you can use redsn0w on non-MC iPod Touch 2G (on both Windows and Mac) as mentioned in our last post.

Guide Before proceeding, download the following files that you will need for your Jailbreak

• iTunes 9.2 for Mac download
• iOS4 iPSW - Official
  • iPhone 4 download
  • iPhone 3GS download
  • iPhone 3G download
  • iPod touch 3G download
  • iPod touch 2G download
• PwnAgeTool for Mac
  • Download Torrent
  • Download File

Step 01 - Sync your iDevice to iTunes. I recommend doing this even before installing iTunes 9.2 because i remember warnings on installing iTunes before jailbreak.

Step 02 - Move the PwnAgeTool and relevant IPSW file to the desktop

Step 03 - Start the PwnAgeTool and select relevant device

Step 04 - By following Step 02 you will ensure that PwnAgeTool successfully detects the IPSW file.

Step 05 - PwnAgeTool will ask " Do you have an iPhone contract that will normally activate through iTunes?". select "No" for this.

note

- If you select 'Yes' The baseband will be updated to the latest 5.13, while this baseband is supported by the ultrasn0w unlock, it is better to keep it on the older baseband.

-- PwnAgeTool will now create a custom firmware for you. This process may take some time so be patient--