https://deadhacker.com/2016/03/25/the-terrorists-phone/ tldr; NAND proxy to prevent wipe. Instigate fake phantom wipe to reset counter+delay for passcode attempts. This was published only a few days before the news that the FBI cracked the iPhone. So it is highly unlikely that the information disclosed was used by their hackers. But based on recent information the attack described in that post, in my obviously biased opinion, seems increasingly probable. Also so far I found nothing in the iOS Security documentation that indicates this attack will NOT work on most recent iPhones. Though it could be that I simply missed an important detail.