CME H2MIDI PRO User Manual page 19

The LED light of H2MIDI PRO does not light up.
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Please check whether the USB socket of the computer is powered, or
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the power adapter is powered.
Please check if the USB power cable is damaged, or the polarity of the
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DC power supply is wrong.
When using a USB power bank, please choose a power bank with Low
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Current Charging mode (for Bluetooth earbuds or smart bracelets, etc.)
and does not have an automatic power-saving function.
H2MIDI PRO does not recognize the connected USB device.
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H2MIDI PRO can only recognize plug-and-play USB MIDI class-
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compliant standard devices. It cannot recognize other USB MIDI
devices that require drivers to be installed on the computer or general
USB devices (such as USB flash drives, mice, etc.).
When the total number of connected device ports exceeds 8, H2MIDI
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PRO will not recognize the excess ports.
When H2MIDI PRO is powered by DC, if the total power consumption
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of the connected devices exceeds 500mA, please use a powered USB
hub or independent power supply to power the external devices.
The computer does not receive MIDI messages when playing a MIDI
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keyboard.
Please check if the H2MIDI PRO is correctly selected as the MIDI input
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device in your music software.
Please check if you ever set up custom MIDI routing or filtering
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through the HxMIDI Tools software. You can try to press and hold the
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