I’d need to check logs, but I suspect the kernel log errors might be red herrings.
You could use dmesg to see if there is anything usb related.
The usb error could be a permissions issue.
Can you check the contents of
/etc/udev/rules.d
There should be a file for the eigenharps , one that was also reloaded via udevadm at install time.
An alternative to see if this permissions are the issue is to run mec manually
cd /sdcard/System/MEC
sudo ./mec-app picopd.jsonUse crtl-c to stop it.