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

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   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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Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 24398	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Topic: ASRock B450 Gaming-ITX/ac - CSM Legacy to UEFI Sec 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


LongTallMatt Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Sep 2023 Location: san diego Status: Offline Points: 85	Post Options Post Reply Quote LongTallMatt Report Post Thanks(0) Quote Reply Posted: 27 Sep 2023 at 3:09am
	That's the issue, right? MBR boot record/partition style?

LongTallMatt Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Sep 2023 Location: san diego Status: Offline Points: 85	Post Options Post Reply Quote LongTallMatt Report Post Thanks(0) Quote Reply 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?

LongTallMatt Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Sep 2023 Location: san diego Status: Offline Points: 85	Post Options Post Reply Quote LongTallMatt Report Post Thanks(0) Quote Reply Posted: 27 Sep 2023 at 2:55am
	Howdy! 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. HALP! :P The computer has been up and running for a year or two now. Operating System Windows 10 Home 64-bit CPU AMD Ryzen 7 3700X 46 °C Matisse 7nm Technology RAM 32.0GB Dual-Channel DDR4 @ 1599MHz (16-18-18-36) Motherboard ASRock B450 Gaming-ITX/ac (AM4) 42 °C Graphics CB272 (1920x1080@75Hz) CB272 (1920x1080@59Hz) 12272MB ATI AMD Radeon RX 6700 XT (Unknown) Storage 931GB Samsung SSD 970 EVO Plus 500GB (Unknown (SSD)) Optical Drives No optical disk drives detected Audio AMD High Definition Audio Device