New day, new tool from iH8sn0w: AutoSHSH. This tool will allow you to save your ECID certificate locally and by doing so, you will be able to downgrade future firmwares.
All you have to do is to install Java on your computer ( you probably already have it installed ), put your iDevice into DFU mode and connect it via USB. Once AutoSHSH recognize your iDevice, you can store your files locally with one click.
Download AutoSHSH.