Yeah, the key question is how Secure Enclave firmware updates work, and whether they can be prevented without pin entry. One former Apple security engineer thinks they are not subject to pin entry: <a href="https:&#x2F;&#x2F;twitter.com&#x2F;JohnHedge&#x2F;status&#x2F;699892550832762880" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;JohnHedge&#x2F;status&#x2F;699892550832762880</a>