F3503022019.7z

: Move the extracted files directly to the root directory of the SD card (not inside a folder). Installation : Turn your vehicle's ignition to ACC or On . Insert the SD card into the vehicle's map/data slot.

: 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.

: 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."

Follow the on-screen prompts to begin the "System Update" or "Software Reinstallation."

If you are attempting to fix a "reboot loop" or update your vehicle's head unit, follow this general guide:

: Use a tool like 7-Zip or WinRAR to extract the .7z file. You should see several files, typically including a .kwi or image file. Format the SD Card : Format your SD card to FAT32 .