Because these are generic Chinese "No-Name" units, you must find the firmware provided by your specific manufacturer or a community repository: Manufacturer Support : Check official forums like those from Autopumpkin , as they frequently share links to Google Drive for A-Media units. XDA Developers
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The "Android Head Units" forum is the gold standard. Search for your MCU version to find stable community-modded ROMs (like Hal9k or Malaysk) which are often better than the originals. Because these are generic Chinese "No-Name" units, you
If you find a file that matches your MCU version and resolution: Amedia Auto's products are known for their high-quality
It is likely a generic firmware file that will cause more problems (broken DSP, lost buttons) than it solves.