Apple finally has released the iOS4.0.1 for public use. It features a new and improved signal bar calculator, which enables accurate display of signal strength. There is absolutely no doubt that a lot of users will get iOS4.0.1 updated, knowingly or unknowingly.
Even if you have your iPod touch 2G or iPhone 3G updated to iOS4.0.1 there is nothing to worry about. You can still use Redsn0w beta 5 to jailbreak iOS4.0.1 and by using ultrasn0w 0.93 you can unlock it too. As we have been doing previously, we once more are back with a simple guide to jailbreak iOS4.0.1 on iPod touch 2G and iPhone 3G on Windows and Mac OS X. Here is the simple guide for the same 
The first step is to download the iTunes 9.3. Then Download iOS4.0 for iPod Touch 2G and iPhone. After that download iOS4.0.1 for iPod Touch 2G and iPhone 3G. The last download is Redsn0w0.9.5 Beta5. The next step is to jailbreak iOS4.0.1 on iPod Touch 2G and iPhone 3G.
- Update iPod Touch 2G/ iPhone 3G 2G to iOS4.0.1 with the help of iTunes software update.
- Start Redsn0w0.9.5 Beta5 and press on browse to select the firmware iOS 4.0 for iPhone 3G.
- Press the Next button and Redsn0w0.9.5Beta 5
- Click on “Install Cydia” and click Next
- Power off your iPod Touch 2G /iPhone 3G and then connect it to computer and press the next button
- Put the iPhone on DFU mode
- Now wait until the jailbreak is complete
