Currently the BIOS doesn´t start the “Linux Boot manager” automatically.
My current workaround is to chosse the “Linux Boot manager” via F11 in the UEFI manually.
—Set-up—
welcome at the fun 
you may need to set boot priority in your firmware? or use efibootmgr to resort boot order in your nvram.
https://man.archlinux.org/man/efibootmgr.8.en
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Hey,
thanks for the Tip.
On Cassini and the last Updates there was no Problems about this.
I rearrange the Bootmanager again, but fails again. :\
Boot option is what device. Then set Hard drive BBS Priorities is the important one! 
Edit: In other words Boot option #1 , Boot Option#2 , Boot option #3 are boot from what device usb, cd-rom, hard drive, network etc…
The other option is the actually boot priority because you may have multiple devices (drives) whether it be nvme or ssd or hard drive etc. So here you set the one you want it to boot from. Endeavouros or what ever the name is it’s using to boot into Endeavour.
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So thanks all. The NVME have to put first.
CSM was default on Off.
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I think the asrock is the olny one like that iirc. The asus, msi, dont show this.
But I could be wrong. I don’t possess an intelligent telephone. I only have a flip emergency phone for CAA when i’m on the road …
Maybe this could be used by the O.P. if one day his motherboard needs warranty, but i’m not sure. 
we do too:
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Oh! I see! good for donations 
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