You could edit the hosts, but it is likely to be problematic. Follow this tutorial here exactly as written and it will let TU download his blobs from Cydia, then set you up perfectly to restore.
HOW TO - Save your SHSH Blobs with TinyUmbrella
Once you've done the tutorial, just press "Start TSS Server" in TU and Shift-Restore the 4.3.3 CDMA firmware for his iPad. The rest should be automatic. Remember, he will need to then sync with his own PC after the resort (assuming you are doing it on yours). Don't set up the sync partnership with your PC.