Trying to upgrade an iPad 4 from 6.1.3 to 7.0.6. I was able to save the 7.0.6 shsh blobs right before the signing window closed. What app do I use to stitch the blob to the 7.0,6 stock ipsw? Tried iFaith 1.5.9 on a Win 7 machine but it throws an exception right after I select the shsh file. Any direction would be GREATLY appreciated.