Hi I too have just purchased an H9 Max Black and everything is not working right. I have updated the software, factory reset and initialized and have done everything but no sound is coming from the unit. I plug my guitar directly to the H9 and to the amp. I used its original power supply included in the box. When the unit is turned off, i can hear my amp but when its on and active, no sound is coming. I cannot connect thru blue tooth also. Is this a defective unit? Its distressing coz we don't have resellers here in the Philippines to ask for help. I bought this from the US.
It sounds like you should connect the unit to your PC via a USB cable, and reinstall the latest firmware in H9 Control. Let me know if this works out for you.