[delroth]

Except that there is no proof of this. It was stated as false by John Kelley, an ex Embedded Security engineer at Apple: https://twitter.com/JohnHedge/status/699882614212075520

For all we know so far, Apple could still provide a signed firmware bypassing the bruteforcing delay implemented by the Secure Enclave.

[jarin]

The only way to bypass the brute forcing delay would be to increase computing power, since it's a function of the encryption method used. It basically goes through a number of iterations chosen to make it take about 80 ms per attempt.

[st3v3r]

Such a thing does not currently exist, though. They would have to develop one.