I have an iPhone 3GS, which was until recently jailbroken with Redsn0w (tethered). Today it got stuck, and I didn't have the redsn0w software on my PC, so I tried re-JBing it with greenpois0n. Only that didn't work. I tried restoring with iTunes, but that didn't work either.
Now when I turn on my phone it's in recovery mode, but iTunes won't do anything because it says it's not activated. I'm not with my original carrier so I can't use the original sim to activate it. Is there any way to restore it without using iTunes? Is there anything I can do?