: Ensure your car battery is healthy or connected to a charger. If the power cuts during a firmware write, the head unit may be permanently "bricked."
: Verify the file source. Using the wrong firmware version for your specific model (e.g., trying to put a Toyota 13CY update on a 15CY system) can cause hardware failure. F3503022019.7z
Follow the on-screen prompts to begin the "System Update" or "Software Reinstallation." : Ensure your car battery is healthy or
: You will need a high-quality SD card (usually 16GB or 32GB). F3503022019.7z