armbian in nanopi M1 with no HDMI sound

Good night, I have the sound problem but with hdmi audio, de default is the 3.5 mm audio jack, then I looked for the asound.conf in /etc, then I found that this file doesn't exist and after that I've created it with the following content:

pcm.!default { 
	type hw 
	card 1 
	device 0 
} 

ctl.!default { 
	type hw 
	card 1 
}

the problem is that even created this way the sound output still being the 3.5 mm jack and I don't know if I need to change some setting to mpv player to output the sound through hdmi.

What else can I do to change the sound from audio jack to hdmi?