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
All you have to do is just hit the reset button.
plug it into itunes and hit restore
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.
no its not actually its recommended
Yes I recently jailbroke my iPod 2nd gen and all the apps I got off iTunes or the AppStore didn't get deleted
you won't get any more free apps and the things you used to have when you jailbroke it. You will also improve the speed your ipod works at and hopefully, the battery percentage will incease.
It does not, unless the update is interrupted or, you restore instead of update.
nope