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UPDATE: I just did it using the terminal app on my mac using SSH and it worked, my UDID is changed but now iTunes can't "read the contents of my device" It is jailbroken by the way (Obviously).
 
i wouldnt mess with something like that.
Why are you trying to change it anyway?

I'm restoring it now to see if it puts it back. If anyone is interested, you can change the UDID of your device by doing this. Hopefully you have a good reason though.


UPDATE: I just restored in iTunes, there is now no jailbreak on it and the UDID is still changed, I'm a bit scared. That page said entering the original MAC Address puts it back, but it is still different, I guess I kind of deserved it.

UPDATE 2: I accidentally entered the Bluetooth Address instead of the Wi-Fi address, it's fixed now. The UDID is the same as before I started.

If you want to change your UDID this is how you do it - http://theiphonewiki.com/wiki/UDID. But I'm not gonna mess around with it.
 
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