Problem installing FreeNAS on eMMC Storage (read only file system, operation not permitted) Odyssey ReComputer

I want to install FreeNAS on the Seeed Odyssey with eMMC storage windows pre installed but not activated.
I am following the official guide:

But when I choose the volume on which it should be installed, after Install/Upgrade, the password prompt and the selection whether bios or uefi it does not start. It just says
“dd: /dev/mmcsd0: Operation not permitted
The FreeNAS installation on mmcsd has failed. Press enter…”

There are 3 partitions mmcsd0 mmcsd0boot0 and mmcsd0bboot1.
But no matter which configuration I choose, it gives me the error.
Can I wipe the eMMC Storage in another way and install freenas as root?

  1. question besides the overall error. Should I create swap before installing?

Can I wipe the eMMC in some way safely? Can I plug the Odyssey into another computer via the usb c at wipe the eMMC as an external storage?

@dasta2210 Navigate to Advanced -> CSM Support and press Enter to enable it. Do you do this?

Yes I’ve enable CSM.
The file system on micsd0boot0 and mmcsd0boot0 are read-only and I assume that these are just the partitions of the SD Card I am using or the eMMC.
Or can I Plug the Odyssey in another computer and wipe the SD card as an external drive? Ist there a flash mode other than the boot mode on the odyssey?

Use another live usb to do this with gparted.

I believe Ubuntu has gparted. Personally on my unit I have had issue with getting non uefi images to boot from eMMc. So far only UEFI Mint or Fedora installed from a live desktop have booted post install on the eMMc otherwise they don’t seem to be recognized by bios. SSD install had no issues.

What do you mean with live usb, a usb Stock with a normal image of freenas ?
How can I wipe the eMMC in another way?because I deleted the eMMC not fully I guess, with the preinstalled windows Boot Manager still existing, but I cannot Boot into this anymore.

I accidentally canceled the first attempt with ctrl-c and now I cannot starte the installation
Should have added the from the beginning to understand the problem.*

I now managed to install freenas, after installing Ubuntu live on the eMMC and then freenas. Thank you.

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Happy to help.

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So gparted delete and format did not work.