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The RKPX3 has a built-in system memory bootloader activated by specific pin states at power-on:

MCU, or Microcontroller Unit, refers to the firmware that controls the microcontroller in the RK PX3 SoC. An MCU update involves updating the firmware of the microcontroller to improve its performance, fix bugs, and add new features. The MCU is responsible for managing the system's peripherals, such as USB ports, audio and video interfaces, and network connectivity.

DO NOT turn off the car or disconnect power during the update. This can lead to a black screen and a non-responsive unit.

Download the correct MCU firmware (usually provided by the manufacturer or found on enthusiast forums like XDA Developers or 4PDA ) and place the .img or .bin file directly on the root of the USB drive. Start the Update: Plug the USB into the head unit's primary USB port.