Connect it to your computer and make sure it's synced and backed up. Then, hold the home and power buttons and count to ten. It should look like it's off and it will disconnect from iTunes. Then take your finger off ONLY the power button and continue to hold the home button (will take a while) until it reconnects. It'll show a generic iPod in iTunes, so hit the restore button. Wait. Then once its done resetting, sync it to your last backup.
Assuming that you are referring to an Apple Mobile Device (iDevice), here are the steps:
To unjailbreak, you will have to restore your device to factory settings
*This requires internet access.
**Do not use Mobile WiFi hotspots / tethered internet from a cellphone. It will be slow and you will be charged a lot of money if you don't have a data plan.
***Please note that if this is the first time restoring to a firmware, it will download around 0.6 - 1.2 GB of data. Make sure you have sufficient bandwidth and speed.
Connect it to iTunes and click restore.
You hit the reset button.
All you have to do is update to the latest firmware.
All you have to do is just hit the reset button.
plug it into itunes and hit restore
You can't you need iTunes.
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.
Connect to iTunes and press restore. If it is bricked just search youtube for how to un-brick an ipod touch.
Yes you can unjailbreak your iPhone by connecting it to iTunes and doing a restore. That will set it back to like it was when it came from the factory.
this will only happen if you choose to update to the newest apple software. updating music and such thru itunes will not touch your jailbreak
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.