Updating 3g to 4 0
To update i Tunes, go to the "Help" menu, and select "Check for updates."If i Tunes says you have the most recent version, you're all set to move on to Step Two.If i Tunes tells you that a more recent version of the application is available, download it.You'll have to review and accept the i Tunes Software License Agreement before the new version will launch.When you have i Tunes open, connect your i Phone to your computer using its USB cable.You can download it if you like, but you don't need it to update i Tunes.
Note: Apple's updater is likely to suggest additional software that you can download (such as the Safari browser); none of this is necessary. You can jailbreak i Phone 3G i OS 4.0.1 with Red Sn0w 0.9.5b5-5.i OS 4.0.1 i Phone 3G jailbreak step-by-step instructions can be found below.To make sure that your i Phone is running the latest version of i OS, you'll need to connect it to your computer and download the update using i Tunes.
But don't worry: the process is pretty painless.Below you can find the direct links to the i Pod touch Firmware Files for every released firmware version.