On jailbroken devices, run Cydia now (upgrade the program if you don't see the heart):
Click the heart to have your device's hash signature saved from future reference.
Deciding not to have your device on file will probably lock the device out of future jailbreaking attempts.
Do not upgrade to 3.1 at this time; this is step one in preparation for maintaining control of your device.
Thanks to the iPhone Development team for thier outstanding help.
Once your has file has been recorded, you'll see this message:
