The Wall Street Journal reports that the FBI has declined to share details with Apple regarding the method with which it broke into the infamous San Bernardino iPhone -- namely because it doesn't really know how it was done either. The FBI and Apple have been publicly battling over this phone for months now, after the federal agency sought a court order (while leveraging a 227-year-old statute to do so) that would have compelled Apple to unlock the San Bernardino shooter's work phone.