Hi, Ctrl+I works when SATA set to RAID in BIOS. Same for the Marvell.
Are they SSDs or HDDs?
Try setting in BIOS / Boot menu
CSM to Enabled and Secure Boot to Other OS.
then try Ctrl+M at restart. See if working.
CSM had been set to Enable. Changed from Windows to Other OS, Ctrl+M not bringing up Marvell BIOS, After ASUS flash page message is "Reboot and Select Proper Boot Device or Insert Boot Media" Thoughts?