I know there is the ODIN method but here is another method to install OFFICIAL stock ICS 4.0.4 on your device.
TO RETURN TO STOCK ON ICS 4.0.4(Will wipe all data):
Step 1: Open KIES on your PC but don't plug your Skyrocket in.
Step 2: Wh...
You have to open KIES without your phone plugged in and hit tools---->firmware upgrade and initialization. Once you open that type SGH-I727(all caps) for your model, then type in your serial number which you will find on the phone behind your batt...
It says under it "80 new" and "5 used". If you want a new case, click on "80 new" and it will show you that case from all the different sellers.
Ok, that certainly clears things up a bit and may explain why it didn't work for me. From your original instructions, my install always hangs at 2% once it has actually started to flash the firmware and I have to recover to 2.3.6 from a backup.