As far as I can tell Apple has never complied with a request for what the FBI is asking for here. It has complied in cases where the phone was not encrypted, or

As far as I can tell Apple has never complied with a request for what the FBI is asking for here. It has complied in cases where the phone was not encrypted, or where a backup in iCloud could be made available to law enforcement, but Apple has never actually produced, signed and installed a custom "this phone only, and only so law enforcement can brute-force it" version of iOS. And given that we're talking about a federal government that was perfectly happy with pictures of the TSA's master luggage key being published in newspapers, I don't fault Apple one bit for being scared of handing over what are basically the keys to the kingdom.