In the FriendlyARM thread http://www.friendlyarm.com/Forum/viewtopic.php?f=53&t=1427&p=5685#p5685
we did try to use A64 images from the Pine64 or the BananaPi M64 with the NanoPi A64.
The last times we did that with less success - OK Sytem is running but Network/Sound has to added via USB.
No suppport for the onboard devices
But today a user did wrote that - with the actual stable Pine64-image ( Armbian_5.69_Pine64_Debian_stretch_next_4.19.13 )
WiFi is us
@Hannes Worst and @mackemint are you using the sound only via HDMI or did you also try analog-audio?
For me the sound is distorted only/mostly at HDMI, but there we have no control in the alsamixer
The saved alsa-state is only my configuration of analog-audio, which work mostly perfect on my amplified Logitech Speakers.
@Hannes Worst which .dtb version did you use for Ubuntu with the kernel 5.4.33?
Low temperatures I do only get like @Hannes Worst in the command-she