If you are running the latest version of firmware (2.0.2) on iPhone or iPhone 3G and have a Mac and want to Jailbreak your device to get Cydia and Installer.app version 4 on there, you are in luck. The iPhone dev team has a tool called QuickPwn for Mac OS X that is similar to its sister app PwnageTool 2.0.3, but is designed for quickly pwning a device, whereas PwnageTool is designed to custom build and tailor the ipsw production process.

This version of QuickPwn requires iPhone software version 2.0.2 so if you haven’t upgraded to that you can get it using iTunes and then use the QuickPwn tool. If you don’t have 2.0.2 firmware on your iPhone or iPod touch, this won’t work!

Update: If you have updated to iPhone software version 2.1, you can download the new version of QuickPwn for 2.1 for Windows. You will also need to download the Bootloader files for iPhone Classic.

Update: If you have firmware update 2.2 and want to jailbreak your iPhone, you can use the latest version of QuickPwn for 2.2 firmware update. Instructions for upgrading from a jailbroken firmware 2.1 to 2.1 are listed below.

Update: If you have iPhone software version 3.0, you should be using Redsn0w to jailbreak and unlock your iPhone or iPod touch, depending on which version you have.

Update: If you want to get iPhone software version 3.1, you will need to use Pwnage Tool 3.1 to jailbreak and unlock your iPhone or iPod touch, which is under development and may be supported by now depending on which device you have.

1. Connect your device and update to firmware 2.2 on iTunes 8.0.2 - your hacked .ipa will remain even when its updated, but all the installed packages from cydia/installer will be removed and will have to be reinstalled.
2. Download QuickPwn 2.2 for Windows or MAC, and run it and it will ask you to locate the 2.2 ipsw (so make sure you have this downloaded)
3. Follow the instruction and you have a jailbroken iPhone or iPod touch with 2.2
4. After a reboot, open iTunes and allow it to sync. You can still use the Mobile patch 2.1

You can download the official release of QuickPwn from the following torrent files. Tip: Use “Archive Utility” that ships with OS X to unzip the .tbz file you download. Don’t unzip the .tbz file you download with “The Unarchiver” tool.

• QuickPWN 2.2.1 for Windows
• QuickPWN 2.2.1 for Mac OS X
• QuickPwn 2.2 for Windows
• QuickPwn 2.2 for Mac OS X
• QuickPwn 2.1 for Windows
• QuickPwn 1.1 for Mac OS X
• QuickPwn for Mac OS X
• QuickPwn Release Candidate (RC3)
• QuickPwn ‘150? Beta Update
• GUI Version
• V1

Download the iPhone or iPod touch firmware ipsw files you need here

Use iPhone mods and hacks at your own risk! Installing 3rd Party iPhone apps requires you to jailbreak the iPhone before installing the native software and apps. Browse the full list of all iPhone and iPod touch native 3rd party apps filed under the software category.

More info here