CM4 EMMC not mounting as Mass Storage Device using rpiboot

[jd3rul]

So after trying to write the Syncrobit (Nebra) image for CM4 eMMC few months ago, looks like the eMMC is not showing up in rpiboot as a mass storage device.

I tried running rpiboot from both PC and another Pi Zero 2W board as HOST and used a CM4 IO Board as SLAVE.
USB cables are good and working on 4 out 7 CM4 eMMC.
The other 3x CM4 eMMC do not show as a Mass Storage Device .

Do you think the .img (helium image file) messed something with the permissions or emmc module : similar to the #60 - #58 ecc slot selection issue ?