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They Hacked McDonald’s Ice Cream Machines—and Started a Cold War | WIRED

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Secret codes. Legal threats. Betrayal. How one couple built a device to fix McDonald’s notoriously broken soft-serve machines—and how the fast-food giant froze them out.

Save this story Save this story Of all the mysteries and injustices of the McDonald’s ice cream machine, the one that Jeremy O’Sullivan insists you understand first is its secret passcode. Press the cone icon on the screen of the Taylor C602 digital ice cream machine, he explains, then tap the buttons that show a snowflake and a milkshake to set the digits on the screen to 5, then 2, then 3, then 1. After that precise series of no fewer than 16 button presses, a menu magically unlocks. Only with this cheat code can you access the machine’s vital signs: everything from the viscosity setting for

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