It's not the SD card mechanism but rather how it reads the files. GPS data is handled by another decoder so it's unaffected while turning digital audio files like .wav, .mp3, etc. to something that can be read by your head unit lies with the DAC chip on the board and that might be the one which is defective. The reason why it can't decode is most probably the culprit of your error message of "bad files". Problem is, your DAC chip is central to the head unit's operations and it's like changing the CPU unit of your computer. Most manufacturers would rather say that you replace the entire board instead since what they usually get are finished-units na with their board assembly being outsourced to low-cost production countries like Taiwan.
That's my guess anyway.







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