Zombater: Something wonky happened. There's no actual 'update' process with the JailBreak, you probably had a bunch of stray .bin files in there that messed things up.
Clear the USB root of such stray .bin files, restart your device, and try the snapshot jailbreak again (it includes MKK, provided you restart your device after the install).
EDIT: That, or you're running FW >= 5.4.5, in which case you'll need to downgrade first to be able to JailBreak.
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