A former Apple engineer said on Twitter:<p>&quot;@AriX I have no clue where they got the idea that changing SPE firmware will destroy keys. SPE FW is just a signed blob on iOS System Part&quot;<p><a href="https:&#x2F;&#x2F;twitter.com&#x2F;johnhedge&#x2F;status&#x2F;699882614212075520" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;johnhedge&#x2F;status&#x2F;699882614212075520</a><p>Then Apple seems to confirm it:<p>&quot;The executives — speaking on background — also explicitly stated that what the FBI is asking for — for it to create a piece of software that allows a brute force password crack to be performed — would also work on newer iPhones with its Secure Enclave chip&quot;<p><a href="http:&#x2F;&#x2F;techcrunch.com&#x2F;2016&#x2F;02&#x2F;19&#x2F;apple-executives-say-new-iphones-also-vulnerable-to-back-door-requested-by-fbi&#x2F;" rel="nofollow">http:&#x2F;&#x2F;techcrunch.com&#x2F;2016&#x2F;02&#x2F;19&#x2F;apple-executives-say-new-ip...</a>