The FBI’s announcement that it mysteriously hacked into an iPhone is a public setback for Apple Inc., as consumers suddenly discover they can’t keep their most personal information safe. Meanwhile, Apple remains in the dark about how to restore the security of its flagship
product. The government said it was able to break into an iPhone used by a gunman in a mass shooting in California, but it didn’t say how. That puzzled Apple software engineers — and outside experts — about how the FBI broke the digital locks on the phone without Apple’s help. It also complicated Apple’s job repairing flaws that jeopardize its software.