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usbliter8 is a tethered bootrom exploit for Apple A12 and A13 SoCs, using an RP2350-based microcontroller board to exploit a USB controller bug and gain low-level device access.
This paper details a novel bootROM vulnerability in Apple A12/A13 SoCs, exploiting a hardware bug in the USB controller and a configuration flaw to achieve boot-chain compromise. A proof-of-concept is provided.