So..I was having issues with my iPhone 4 (Verizon, jailbroken 4.2.6). I decided to restore and start over. I've tried 3 computers and every one is having its own errors. 1. Mac: Tried PwnageTool. Worked fine. iTunes have me an error yesterday. I think Error 21. 2. Windows Vista: Used SnowBreeze. Worked fine. Restored in iTunes using the custom IPSW. Worked fine until it tried booting for the first time. iPhone was stuck at the Apple logo forever. Tried again, but something different wouldn't work in iTunes. I can't remember what. 3. Windows XP: This computer is older. It WILL NOT open SnowBreeze. Just gives me an error. So I tried taking the custom IPSW from system 2 and restore using this iTunes. Gives me an error 1600. 4. Tried Mac again. I keep getting every issue you can think of. Stuck at Apple logo after it finishes, error xx, error xx, etc... Using the Mac, I can get it to finish with some hard work, but then it still gets stuck at the Apple logo. Any ideas? Stock iOS is killing me. And I'm so frustrated! Thank you.