Restoring ipod touch to factory settings without updating
Here's some of them: THE GROUND REALITY OF RESTORING WITHOUT A BACKUP If you have never backed up your i Device in i Tunes, it will not let you backup the device when it's locked.
Unfortunately, in this case, we've only got a locked and disabled i Phone that can only be restored as new via i Tunes. This will be apps, app data, contacts, photos, music and most of everything that resides on your i Phone/i Pad.
You can do this by plugging your device into a computer that has i Tunes installed, holding the power (lock) button and home button for 10 seconds, then releasing the power button while you keep holding the home button for another 15 seconds.
Then i Tunes should recognize it and allow you to restore it.) Thank you for your interest in this question.
I believe all of the current jailbreak solutions work by modifying an IPSW file for the device, and flashing that back on to it.
To remove it, you would need a clean IPSW and to do that you need to restore it through i Tunes.
A friend has an i Phone and they need to wipe it and remove the jailbreak on it. The problem is they don't have access to a computer with i Tunes on it to do this. Will doing an 'erase all content and settings' lock the phone?
There are, of course, some workarounds that you can explore.
If your last i Tunes backup was a while ago, you risk losing any data added to your device since your last i Tunes backup.
However, there is now a software that claims to get your i Phone out of recovery mode, without causing data loss (this method has also been known to work on a pesky i Pad or i Pod Touch stuck in recovery mode).
There are times when things may go wrong with the phone or touch and you may need to restore the device to factory settings and start over.
This guide explains how to restore the phone to factory settings using i Tunes.