I recently upgraded to iOS7 from 6.1.2 jailbroken. I now want to downgrade back to a jailbroken 6.1.x firmware. I have only saved an SHSH blob from my 6.1.1 firmware onto my HDD. I believe Cydia saved my 6.1.2 SHSH blob, but I did not export it or download it before upgrading to iOS7. What's the best way to downgrade back to 6.1.1 with my SHSH blobs? I don't know how to use them.