Musclenerd today, just confirmed that the next gen redsn0w which will work on geohot’s limera1n will make 4.2.1 untethered. For the folks who have 4.2.1 on their idevices and have jailbroken already will not have to restore their devices, since the new redsn0w will just require a re-run redsn0w and the new ramdisk will install on its own and replace the old one.
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