First post here. Be gentle.

Not sure if this is the correct place to post for this. I struggled for some time getting Stellarmate and my Orion SSAG Pro mono function with stellarmate os/ekos.
I just updated to 1.5.4 and it overwrote my fix, so I figured I should speak up in case it might be worked in to the next update.

Initially with lsusb the device shows as with lsusb as Van Ooijen Technische Informatica idVendor 16c0 idProduct 29a2.

I updated /lib/udev/rules.d/85-qhyccd.rules with
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="29a2", RUN+="/sbin/fxload -t fx2 -I /lib/firmware/qhy/QHY5.HEX -D $env{DEVNAME} -s /lib/firmware/qhy/QHY5LOADER.HEX"

Reboot and then lsusb shows a new idProduct

Then I add
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="296d", RUN+="/sbin/fxload -t fx2 -I /lib/firmware/qhy/QHY5II.HEX -D $env{DEVNAME}"

to mach the product id change and reboot again.

Viola - Starting Ekos with QHY drivers shows
QHY CCD QHY5LII-M-6017e and I can use my Orion SSAG Pro mono.

stellarmate@stellarmate:~ $ dmesg | grep QHY
[ 7.999156] usb 1-1.3.3: Product: QHY-PoleMaster
[ 8.471518] usb 1-1.3.4: Product: QHY5-II

I'm probably doing something wrong, but it has worked for me.

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