Leo stared at the screen. He could open any car made between 2015 and 2020 that used that chipset. He could reprogram pacemakers, spoof smart meters, or—with the pmu_raw_write command—overvolt a device until it melted.

Leo’s blood ran cold. The board had no network interface. The only connection was the USB cable to his offline laptop.

He’d found it in a surplus bin at the electronics market, buried under a pile of decommissioned smart locks and broken drone controllers. The vendor, a grizzled man with solder burns on his fingers, had waved a dismissive hand. “That? Firstchip’s forgotten stepchild. MP Tool means ‘Mass Production Tool’—a debugging skeleton for a chip that never launched. 2019. Dead architecture.”