It's my friends iPod, don't wanna try it yet in case something happens, I need a safe methodUhm does
Instructions: Go onto iPhone/iPod Touch internet and type the above link then slide it.
Not sure if works for 4.0.2
if it doesn't it wont allow you to slide.
You can only do this if you either 1. Have previous SHSH blobs saved, in which case you can downgrade to a jailbreakable firmware (if you have newer iTouch or iPhone) You cannot do this if you have a iDevice that is or above; iPhone 3gs (new bootrom) or above, or any iPod touch 3g or above, you cannot jailbreak it at this time. You will need to wait for the release of Greenpois0n or the new Pwnage tool.
If you are 3gs (old bootrom) or lower; or iPod touch 2g or lower, you may jailbreak with Redsn0w, or Sn0wbreeze. Which you can download and use the guide from here.