Jailbreak iPhone 3G and iPod touch 2G on 4.0.2

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The newly released Apple firmware 4.0.2 fixes the PDF security hole that was used by JailbreakMe to jailbreak without the use of a computer. Though JailbreakMe does not jailbreak 4.0.2, Redsn0w is able to jailbreak iPhone 3G, and iPod touch 2G (non-MC model).

1. Make sure you are on firmware 4.0.2 by going into the Settings app, General, About, then down to Version. If you're not on 4.0.2, go into iTunes and click the Update button.
2. (Skip this step if using iPhone 3G) While you're there, scroll down to Model, if the first two letters start with MC, this jailbreak will not work for you. If the Model starts with something else (MB, etc.) you're fine.
3. Download Redsn0w 0.9.5b5-5 for Windows | Download Redsn0w 0.9.5b5-5 for Mac
4. (Skip this step if using iPhone 3G) Download the iOS 4.0 firmware file by going here, clicking on the second drop down bar, and finding iPod touch 2G (4.0/8A293).(This is not a mistake)
5. (Skip this step if using iPod touch 2G) Download the iOS 4.0 firmware file by going here, clicking on the second drop down bar, and finding iPhone 3G (4.0/8A293).(This is not a mistake)
6. Open Reds0w and click the Browse button. Point it to the file you downloaded from one of the two above steps. Click Next.

7. Make sure Install Cydia is checked and click Next

8. Plug your device into your computer and turn it fully off. Click Next.
9. Now be ready to follow the on-screen instructions. They will tell you what to do with your buttons. Make sure you follow them properly. (If you think you've messed up, stop, close Redsn0w, and hold down both home and power buttons for about 15 seconds until your device restarts. Then repeat above steps.)
10. Now wait until Redsn0w is finished doing its thing.