Ok. Got the 1600 errors to clear
Now I get to the snowbreeze screen (on the phone) and iTunes gives me an error 14....
Eff
You are going about this in the wrong way.
1. Snowbreeze does not work with 4.2.1
2. You cannot restore to custom IPSW 4.1 without SHSH files saved.
You best option is to restore to stock 4.2.1 again and then jailbreak with redsn0w, Select the hactivation option so that you can get access to the phone. Before you run the restore from apple
open tiny umbrella go to Advance mode and uncheck the box that says change host file to cydia on exit then close tiny umbrella. This will set your host file so that gs.apple.com is correctly point to the 127.x.x.x ip address.
After the Redsn0w jailbreak run the latest Greenpo1son which will make the redsn0w tether jailbreak untether.
You will still not be able to use the phone as a phone because no matter what you do at this time you cannot unlock. You have to wait for the new Ultrasn0w which hopefully should be out shortly.