The conclusion is pretty clear.
Ultimately, the question to be answered in this matter,
and in others like it across the country, is not whether
the government should be able to force Apple to help it
unlock a specific device; it is instead whether the All
Writs Act resolves that issue and many others like it yet
to come. For the reasons set forth above, I conclude that
it does not. The government's motion is denied.
It doesn't answer the question that was on my mind ("Can the FBI force Apple to write and cryptographically sign a less-secure version of their operating system?"), but it's nice to know that the AWA doesn't grant them that capability.