The government last week revealed new details about the iPhone that is at the center of an increasingly bitter dispute between federal authorities and Apple.

In an affidavit submitted by the Federal Bureau of Investigation (FBI) last week, an agent spelled out the steps his team took to access the content on the iPhone 5C used by Syed Rizwan Farook, who with his wife, Tafsheen Malik, killed 14 in San Bernardino, Calif. on Dec. 2, 2015. The two died in a shootout with police later that day.

The government has labeled the attack an act of terrorism, and has acquired a court order requiring Apple to help the FBI break the iPhone’s passcode so that investigators can pull data from the device. Apple has contested the order.

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