Home Assistant Booting is not working

Good evening, I’m trying to install Home Assistant on my Fujitsu Futro S720. I upgraded it to 4GB RAM and 64GB Msata. Flashing the SATA worked so far. However, it doesn’t want to boot but shows me that I should insert a bootable medium. Can someone please help me, I’m desperate.
Unfortunately I can’t upload any photos.

Which of these methods did you follow?

Did you ensure the BIOS settings are correct as per the instructions?

I followed the first method. In my BIOS my 64gb mSata is prio #1.
I will check the other settings
edit: I checked the settings, they all okey.

I now flashed Home Assistant onto a USB stick and it worked straight away.

Hey Florian,
So HAOS does work on the s720? I found a couple of story’s saying it doesn’t support eufi boot.
And on mine I always get a black screen when trying to boot HAOS on the internal ssd. Did you get it to work there as well or only on the usb stick?
And what settings did you change in the bios?
Thanks in advance.
Lukas