In the FBI’s court order requesting Apple's assistance in unlocking the work iPhone 5c used by the San Bernardino shooter, the bureau's first and most urgent demand is that Apple disable the iPhone's “auto-erase” security feature. This feature (which is not enabled by default on most iPhones) protects user data on a device from would-be snoops by wiping the phone after 10 failed passcode attempts. This protects you and me from thieves trying to guess our passcodes and access our data for identify theft, for example.
But the truth is that even if this feature is enabled on the device in question, the FBI doesn't need to worry about it, because they can already bypass it by backing up part of the phone (called the “Effaceable Storage”) before attempting to guess the passcode. I'll go into the technical details (which the FBI surely already knows) below.
One of the FBI’s Major Claims in the iPhone Case Is Fraudulent | American Civil Liberties Union
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