All guide to jailbreak iOS 4.0.1 firmware on iPhone 4, iPhone 3GS, 3G and iPod Touch 3G, 2G (MC, non-MC). JailbreakMe 2.0, the new userland jailbreak by Comex can jailbreak 4.0.1 firmware on all iPhones and iPod Touches including New BootRom devices.
iOS 4.0.1 is now available for download. You can jailbreak iPhone 3G iOS 4.0.1 with RedSn0w 0.9.5b5-5. iOS 4.0.1 iPhone 3G jailbreak step-by-step instructions can be found below. For the rest of the devices (iPhone 3GS, iPhone 4 and iPod Touch), wait for the Comex jailbreak to come out which is expected soon.