How to save ECID certificate using iReb [Video]
iH8sn0w is working on a new tool in its program iREB, that will save the ECID certificate for firmware 3.1 on your computer.
Using this ECID saved on your computer and a tool from Saurik, you will be able to perform a downgrade from one firmware to another (3.2 to 3.1)
Here is a video showing some details: