Apple should just build their sysyem so that it can not be backdoored. Make the TrustedZone non upgradable or give the signingkey to the use (Smartcard in the package of the phone). User can either keep or destroy the key, as they see fit.<p>More security for everybody. No backdoors. The FBI can as for speciak version all they want.<p>To be sure, they could still ask apple for a prober backdoor, but at least they can anker it to a individuel case.