Question Boot options menu missing

Go6s

Prominent
Sep 26, 2019
3
0
510
Hello,
I have a new Asrock B450M HDV R4.0 with a R5 2600X
After a couple boots, I don't have the "asrock" menu with boot options anymore, and if I press del or any button during start, my PC freezes with a black screen, which means I don't have access to the bios/uefi (bios in my case, MBR partition)
I have made clear cmos, with battery out, but still nothing.
I guess the firmware is broken, but my PC is actually working fine with default setup !
Asrock only provides updating solution thru the bios, what should I do ?
Thanks for your help