iOS 4.2.1 untethered jailbreak are ready
greenpois0n has announced their jailbreak software for iOS 4.2.1, unthetered one, but when i tried to download it, their web said that currently offline. Well, and the version of software is only for mac user 
.
iphonedownloadblog has already written on their website on how to jailbreak your iOS 4.2.1, in 7 step.
it’s your gadget, and your decision 
nuff said
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