Problem with PC starting from M.2 drive.
Problem with PC starting from M.2 drive.
Your BIOS update on the x370 SLI PLUS seems to be working correctly—your M.2 drive appears in system status and shows the right size. This might not be related to the BIOS version itself but could stem from driver issues or storage configuration. Try checking the drive’s boot settings, ensuring it’s properly seated, and verifying the firmware version on the motherboard. If problems persist, consult the manufacturer’s support or check for any pending updates.
Restart the BIOS settings again. Check if it resolves the issue.
The installation process may be choosing CSM over UEFI, while the BIOS could be set to UEFI or missing the alternative.
Your operating system must be set up in UEFI mode when installing from a UEFI installer. If your BIOS recognizes the drive, it should work, though it won’t appear in the boot menu—only the UEFI boot manager will see it after installation. Using a CSM/MBR for a GPT install requires careful conversion, as explained [here](https://www.maketecheasier.com/convert-l...-windows10). If your BIOS is configured for compatibility mode and the drive is marked as CSM, it may not boot in EFI. Switching between CSM and UEFI is not recommended; doing so usually breaks the installation process. You might need to enable the CSM option in the BIOS and try again. Alternatively, if you installed a GPT partition while in CSM mode and updated the BIOS, it could default to UEFI on the next boot.
It depends on the partition table the system used during setup. If you installed Windows 10 directly to a blank drive without any configuration, it likely used GPT (UEFI) which requires a modern OS. If the drive instead uses MBR (CSM), the BIOS must have Legacy Boot Mode enabled for it to function properly. Sometimes these settings conflict—disabling one may be necessary. Experiment with toggling options like Legacy Boot Mode, CSM Boot Mode, or Boot Compatibility Mode in your BIOS.
It used to be legacy+uefi now it's just "uefi". I can't modify it for any reason.
Did you turn off W10 WHQL support? For reference, a new install could be necessary if you're using an older boot version. To consider upgrading to W11, you should not be running in legacy mode at all.