I've been told if you have ifile and you go to /Applications and delete all third party (jailbroken) apps and software then that will work. I'm not entirely sure I've never tried. That's what someone said on a forum. Good Luck ^_^.
You hit the reset button.
To 'unjailbreak' an iPod Touch, you have to do a system restore, which is available in the iPod Touch home menu in iTunes. This will erase all content that is on the iPod Touch, including bookmarks in Safari and contacts in the Contacts.
Yes iTunes>(iPod Touch Name)>Restore
Yes, updating the software of an iPod undoes the Jailbreak.
All you have to do is just hit the reset button.
plug it into itunes and hit restore
Un-jailbreaking your iPod Touch means that iTunes must recognize your iPod. Without the recognition, you cannot Restore the iPod (Restoring it 'un-jailbreaks' it). Your warranty is void since you made an unauthorized modification to the iPod (jailbreaking it voids the warranty). The best you can do to 'un-jailbreak' it is to take it to an Apple Genius to have it restored from there.
Yes and no. If you sync it your iPod will remain jailbroken. If you update it to say 4.1 it will un-jailbreak your iPod. Then you will need to re-jailbreak it.
Connect to iTunes and press restore. If it is bricked just search youtube for how to un-brick an ipod touch.
It is impossible, you need a computer
yes, it charges it unless it is not a charge cable but if you are using the one that apple gave you then it will charge.
yes in itunes