iTunes Error 21 using sn0wbreeze

[aszynka]

Hi, I had an 4.3.1 iPhone with iPad baseband. Used sn0wbreeze to make custom IPSW then DFU with iRef and now, when trying to upgrade with iTunes I'm geting error 21. Please guys help me. It's my gf's phone and she's gonna kill me if it won't work

Oh damn, I've forgotten to say- I'm trying to update to iOS 5.0

[iYeow]

Use Redsn0w RC18 or 19 to put your iphone into dfu mode and restore again. Don't you have 4.3.3 blob ?
Are you using tss server to verify your 4.3.1 blob ?

It looks like you are going to sleep on the sofa in the living room tonight if you don't get it going

[aszynka]

Oh dude I'm saved!!! God I was so afraid she won't marry me if i screw it up, hahah... Just kidding. For any others that are looking for solution on this one- try first to restart PC then unplug any other USB Device, reinstall iTunes, then it worked for me even with sn0wbreeze. Thans a lot!