There are videos online showing that the car's head unit hardware can be upgraded through unauthorized modifications. Is this feasible?
It is not feasible. The original head unit hardware has undergone professional testing and verification including safety, environmental adaptability, robustness, NVH and sealing reliability, and durability. Unauthorized modifications will introduce uncertain safety and quality hazards and result in the loss of corresponding quality assurance (for specific warranty details, please refer to the Quality Guarantee Service section in the User Manual).