BlueOS not booting on CM4 with EMMC

Blue Robotics Products
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1

Hi all,

I’ve been trying to install blueOS on a CM4 (8GB ram, 32GB emmc) and cannot get the image to boot, I’ve flashed using balena etcher and raspberry pi imager and in both cases the CM4 won’t boot. I’ve tried flashing BlueOS latest stable image, latest beta image, and 1.1.

When flashing ubuntu or raspbian I’ve got no issues booting. Does the blueOS image support EMMC?

2

Found a solution that seems to work from here

  1. I used usbboot to mount the boot partition on the EMMC.
  2. I downloaded all start*.elf and fxup*.dat files from the official raspberry pi firmware repo boot folder here
  3. I copied all of those files into the mounted boot partition, replacing what was already there.

Boots fine now, but this may mean the blueOS image that is provided on each release is broken for EMMC based Pi CM4s

3

Just confirming for future visitors that this issue is still present in Jan 2026 and that this fix still works.