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ASRock B450 Gaming-ITX/ac - CSM Legacy to UEFI Sec

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Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
Printed Date: 02 Mar 2024 at 1:31am
Software Version: Web Wiz Forums 12.04 -

Topic: ASRock B450 Gaming-ITX/ac - CSM Legacy to UEFI Sec
Posted By: LongTallMatt
Subject: ASRock B450 Gaming-ITX/ac - CSM Legacy to UEFI Sec
Date Posted: 27 Sep 2023 at 2:55am

I'm trying to turn secure boot on, but when I do, it seems the motherboard no longer recognizes my NVME drive as a boot drive. Am I doing something wrong, or have I just started wrong and cannot go back?
So my boot options in bios are currently set to CSM / Legacy. If I change it to Ultra Fast UEFI it doesn't seem to see the NVME and boots into BIOS. Then I turned on Secure Boot in that new setup and it still boots to BIOS.
It sees the NVME still with those settings turned on, but I'm not sure what's going on.


The computer has been up and running for a year or two now.

Operating System
     Windows 10 Home 64-bit
     AMD Ryzen 7 3700X     46 °C
     Matisse 7nm Technology
     32.0GB Dual-Channel DDR4 @ 1599MHz (16-18-18-36)
     ASRock B450 Gaming-ITX/ac (AM4)     42 °C
     CB272 (1920x1080@75Hz)
     CB272 (1920x1080@59Hz)
     12272MB ATI AMD Radeon RX 6700 XT (Unknown)
     931GB Samsung SSD 970 EVO Plus 500GB (Unknown (SSD))
Optical Drives
     No optical disk drives detected
     AMD High Definition Audio Device

Posted By: LongTallMatt
Date Posted: 27 Sep 2023 at 3:08am
bah!!! MBR.. doof! easiest way to fix is new drive format as GUID then clone over or will clone copy partition style?

Posted By: LongTallMatt
Date Posted: 27 Sep 2023 at 3:09am
That's the issue, right? MBR boot record/partition style?

Posted By: Xaltar
Date Posted: 27 Sep 2023 at 3:38am
Yes, MBR won't work without legacy mode enabled which needs to be disabled for CSM
to work. There are quite a few guides and videos on how to resolve the issue.
Good luck


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