How to flash the eMMC on the Mars CM?

I tried to flash my Mars CM via a Waveshare CM4-IO-Base-A Board and via an updated Turing Pi v2, and in both cases it doesn’t work.

The CM4-IO-Base-A Board doesn’t show up on my laptop when connecting it via USB-C (yes I put it into Boot mode) and the Turing Pi (after updating to BMC 2.0 RC1) states “No supported devices found”

:thinking: