IPhone 4s won't unjailbreak?

So I tried to unjailbreak my 4s and update to 5.1.1, but when I did I got an error 21 and now the phone is BRICKED. I can't kick it out of recovery, iTunes WON'T restore it. What can I do?! I've put it into DFU mode and even tried restoring it with an IPSW from a 3rd party! Yes I'm on the latest *** version of iTunes, yes all my ports work and there's no web security because it. A MAC

To be honest, i don't know. Are you sure your in DFU and not recovery? I think (on windows at least) you have to patch your hosts to not direct to an apple server. I imagine the same is necessary for OSX. And what do you mean by third party Firmware? Do you mean downloaded from a source other than itunes? If so don't oworry its exacctly the same as the one downloaded from itunes.

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