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WASHINGTON (AP) — The FBI’s announcement that it mysteriously hacked into an iPhone is a public setback for Apple Inc., as consumers learned that they can’t keep the government out of even an encrypted device that U.S. officials had claimed was impossible to crack. Apple, meanwhile, 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. The Justice Department’s announcement that it was dropping a legal fight to compel Apple to help it access the phone also took away any obvious legal avenues Apple might have used to learn how the FBI did it. Magistrate Judge Sheri Pym on Tuesday vacated her Feb. 16 order, which compelled Apple to assist the FBI in hacking their phone. The Justice Department declined through a spokeswoman to comment Tuesday. A few clues have emerged. A senior law enforcement official told The Associated Press that the FBI managed to defeat an Apple security feature that threatened to delete the phone’s contents if the FBI failed to enter the correct passcode combination after 10 tries. That allowed the government to repeatedly and continuously test passcodes in what’s known as a brute-force attack until the right code is entered and the phone is unlocked. It wasn’t clear how the FBI dealt with a related Apple security feature that introduces increasing time delays between guesses. The official spoke on condition of anonymity because this person was not authorized to discuss the technique publicly. FBI Director James Comey has said with those features removed, the FBI could break into the phone in 26 minutes. The FBI hacked into the iPhone used by gunman Syed Farook, who died with his wife in a gun battle with police after they killed 14 people in December in San Bernardino. The iPhone, issued to Farook by his employer, the county health department, was found in a vehicle the day after the shooting. The FBI is reviewing information from the iPhone, and it is unclear whether anything useful can be found. Apple said that the legal case to force its cooperation “should never have been brought,” and it promised to increase the security of its products. CEO Tim Cook has said the Cupertino-based company is constantly trying to improve security for its users. The company declined to comment more Tuesday. The FBI’s announcement — even without revealing precise details — that it had hacked the iPhone was at odds with the government’s firm recommendations for nearly two decades that security researchers always work cooperatively and confidentially with software manufacturers before revealing that a product might be susceptible to hackers. The aim is to ensure that American consumers stay as safe online as possible and prevent premature disclosures that might damage a U.S. company or the economy. As far back as 2002, the Homeland Security Department ran a working group that included leading technology industry executives to advise the president on how to keep confidential discoveries by independent researchers that a company’s software could be hacked until it was already fixed. Even now, the Commerce Department has been trying to fine-tune those rules. The next meeting of a conference on the subject is April 8 in Chicago and it’s unclear how the FBI’s behavior in the current case might influence the government’s fragile relationship with technology companies or researchers. The industry’s rules are not legally binding, but the government’s top intelligence agency said in 2014 that such vulnerabilities should be reported to companies and the Obama administration put forward an interagency process to do so. “When federal agencies discover a new vulnerability in commercial and open source software — a so-called ‘zero day’ vulnerability because the developers of the vulnerable software have had zero days to fix it — it is in the national interest to responsibly disclose the vulnerability rather than to hold it for an investigative or intelligence purpose,” the Office of the Director of National Intelligence said in a statement in April 2014. The statement recommended generally divulging such flaws to manufacturers “unless there is a clear national security or law enforcement need.” Last week a team from Johns Hopkins University said it had found a security bug in Apple’s iMessage service that would allow hackers under certain circumstances to decrypt some text messages. The team reported its findings to Apple in November and published an academic paper after Apple fixed it. “That’s the way the research community handles the situation. And that’s appropriate,” said Susan Landau, professor of cybersecurity policy at Worcester Polytechnic Institute. She said it was acceptable for the government to find a way to unlock the phone but said it should reveal its method to Apple. Mobile phones are frequently used to improve cybersecurity, for example, as a place to send a backup code to access a website or authenticate a user. The chief technologist at the Center for Democracy and Technology, Joseph Lorenzo Hall, said keeping details secret about a flaw affecting millions of iPhone users “is exactly opposite the disclosure practices of the security research community. The FBI and Apple have a common goal here: to keep people safe and secure. This is the FBI prioritizing an investigation over the interests of hundreds of millions of people worldwide.”