&gt; I can&#x27;t find anything in the guide from a quick skim, but I&#x27;d suspect the code is on a ROM chip or is somehow prevented from an upgrade without an unlock?<p>This is the big unanswered question. I suspect the same, but so far have not been able to find anything that actually says so. The code is not in ROM, as it can be updated, but it could wipe data if updated without an unlock. But I can&#x27;t find anything saying whether it actually <i>is</i>. The mere fact that it&#x27;s possible isn&#x27;t enough, and their silence is a bit odd.