I tried both a restore to IPSW 4.2.6 and 4.2.7 and both failed. I ran iReb and used TinyUmbrella and it failed after verifying with Apples Server (TinyUmbrellas server) on both accounts.
After apple stops authorizing an older IPSW the only way to restore is the have the SHSH blobs backed up to either Sauriks Server from Cydia or through Tiny Umbrella on your PC. My prev phone had the SHSH Blobs going all the way back to ios 4.0, If you ever restore a phone to an earlier ios check in cydia first or with Tiny umbrella and see if it shows the earlier SHSH info and that would be why it restores.
iReb allows bypassing of the iPhone checking the signatures of the firmware you are loading.
BTW: I wanted to thank you for continuing to help me on this. I am really stuck.
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