Asrock H510 BTC+ : Bios issue in CSM mode

Hi there,

I’m facing an issue with my Asrock H510 BTC + (bios 1.40) and hiveos

If i use the UEFI bios, I cannot boot properly ( Error cant find command echo…) ; 4G decoding is enabled, all PCIE in GEN2
If I use CSM (and all to legacy), the MB goes straight to the bios and I have to manually select the my SATA SSD HD in the Boot Override to start booting. It happens only if I plug 2 or more GPU. With one GPU, everything is ok.

This makes me crazy… Any clue ?
Cheers,

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