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User manual, download link of JM21
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What should I do if the JM21 crashes or freezes? Forget Password?
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How to access the storage/SD card after connecting the JM21 to a computer?
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How to upgrade the JM21?
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How to switch the working mode of the JM21?
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How to enable the USB DAC function for JM21?
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How to use the JM21 as a Bluetooth receiver?
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How to use the JM21 as a Bluetooth transmitter?
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How to connect the JM21 to an external decoder? Does it support USB audio digital output?
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How to output coaxial digital signal from JM21?