Today Apple has released a patch for their operating system iOS, which closes a security hole, mobile Safari. In other words, by installing this update, you won’t be able to do jailbreak your device.
iOS 4.0.2 is available for the following devices:
iPod touch 2G
iPod touch 3G
iPhone 3G
iPhone 3GS
iPhone 4.
3.2.2 available for iOS iPad and iPad 3 g.
If you want to continue to use hacked device, then you should not install this update.