Can't boot from USB but from HDD (MSI B560M-A Pro)

Hi,

i can install OMV 6 from an USB drive to an other USB drive. But when i try to boot then OMV my mainboards starts the UEFI every time. The UEFI recognizes the USB drive and its at first boot position - but doesn't boot. Secure boot is disabled. UEFI isn't in 'Bios Mode' (CSM). Is there a special setting to boot from USB drive when using UEFI? I had never problems with that on other mainboards.

Installing OMV 6 on a normal 2,5'' HDD works and i can boot from the HDD.

edit

i tried this from USB2.0 and USB3.0 ports. all the same.

I'm using the OMV ISO. I tried a normal Ubuntu 20.04 image from USB, this works.

I have the same problems with debian 11.2 netinst.

I used 'dd' so create the install stick.The stick is booting and i can install The system to an other stick. OMV from the second stick isnt starting.

There is 'uefi' before the Name of the USB stick. Is it then running in uefi mode?

There is no ESP-Partotion. The file system is 'iso9660'.

At the moment i can't test it on a windows-pc. perhaps at the weekend.

But to understand the problem. I searched a little bit and found some awsers to similar questions. UEFI mode should be a 'image thing', means the image should be in UEFI mode. All my linux are installed on UEFI on systems with GPT and i've always used 'dd'. Is there something different with the OMV-Image?

I could create a boot stick with UEFI mode using windows 7 in a virtual machine but this did not solve the problem.

The boot stick has a fat32 partition with esp flag.

I don't think its a problem with the UEFI mode. I think there is something wrong with the bios/uefi settings.

Can i install OMV5 on top of Ubuntu Server 20.04 instead of Debian 11?