@mobpsychedelic: device jailbreak should survive future firmware updates as long as you don't do: 1) firmware update followed by factory reset 2) factory reset followed by firmware update. Those are the cases when hotfix can't help you regain all components of device jailbreak and brigde (=reinstall-jailbreak-on-first-reboot-after-firmware-update).
Un-registering device just deletes MKK keys that are used for running kindlets/active content such as KUAL. That problem is easily fixed.
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