Finally got the Radxa emmc (64GB) in. Applied several images (Ubuntu Server, Android TV), no boot. uSD boots fine.Image seems to write fine (many attempts). Partitions seem normal. No HDMI output at all.
Cloning a workable uSD image to the eMMC also fails to boot.
Also, uSD will not boot when eMMC is installed.
In addition I also tried installing thru the OTG port with rkdeveloptool. Image written successfully but still fails to boot.
Any suggestions? eMMC operations on RockPi4 broken?