Hi jindr,
Did you end up getting this to work?
My biggest question is whether the boot switch next to the USB-C port simply disables eMMC boot, or if it bypasses entirely the boot.conf sequence and sends the device into USB-OTG boot (that would be 5 or 3 based on the Raspberry documentation. From what I can gather it’s more the second option, as I’ve tried a USB-A stick boot and it simply did not go anywhere (power led on, nothing happens).
I’ll flash the firmware with my own boot sequence and see what happens.
Cheers,
Jérôme