&gt; nothing (OS-WISE) changes hands, it doesn&#x27;t &#x27;get out&#x27;<p>It would have to &#x27;get out&#x27; if it&#x27;s installed on the phone. You are assuming the FBI (or other interested TLA agencies) lack the ability to extract the the compromised OS from the phone and&#x2F;or retarget it to other devices. An even more nefarious scheme would be to modify the current code on the iPhone so that it logs Apples signing as they apply the update, but that edging into tinfoil territory