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MSI X570 BIOS Boot Mode Select grayed out

Cpfb68

Hey all,


Just finished putting together a new system and having an issue with the BIOS and changing the Boot Mode to include Legacy.

 

MSI X570 board with newest version (E7C84AMS.150 - 1/20/21). 
 

Put the system together with an AMD Ryzen 5 5600X and 16GB Corsair Vengance Pro 3200.

 

First boot, everything posted fine and went right to the BIOS Advanced screen.

 

I had pulled my Samsung 860 SSD with Windows 10 Pro from my old system to see if I could get it to boot to windows.

 

I went into Settings - Boot - and the Boot Mode Select is grayed out and set to UEFI. I have searched online and here for an answer why this is locked. 
 

One answer was to change SATA Mode to AHCI from SATA but it booted to AHCI mode.

 

Any ideas why it’s locked?

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