I currently have an iPhone 4 (4.3.1/04.10.01) that was previously jailbroken on 4.2.1 through greenpoison, but was successfully updated through Pwnagetool. I also have two brand new iPhone 4's that are running 4.2.1/03.10.01 and I'm having issues jailbreaking these as well. I went through the same process that I did with my other phone. I downloaded the appropriate firmware, created the custom firmware build, and attempted to restore using iTunes. Each time on both phones the error message reads, "Device is ineligible for requested build" or something to that effect. Any ideas?