Solutions
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Murali KG's post in Support for Radxa CM3 / Rockchip RK3566 was marked as the answerYou can just download rock-3a edge(6.18+) images (not vendor 6.1) and change the device tree entry (sdcard/boot/armbianenv.txt) to point to "rockchip/rk3566-radxa-cm3-io.dtb" . This seems to boot fine with majority of features working.