To disable CSM (Compatibility Support Module) in BIOS/UEFI setup, generally the steps are:
- Restart the computer and enter BIOS setup by pressing keys like Delete, F2, or a specific key shown on startup.
- Navigate to the Boot tab in BIOS.
- Find the CSM or Launch CSM option.
- Change the setting to Disabled to turn off CSM.
- Save the changes and exit BIOS, typically by pressing F10.
Depending on the motherboard brand, the exact menu location of CSM varies:
- Asus: Boot tab → Launch CSM → Disabled
- Gigabyte: BIOS tab → CSM Support → Disabled
- ASRock: Boot tab → CSM → Disabled
- MSI: Boot tab → Boot Mode Select → UEFI only (this disables CSM)
Disabling CSM switches the system to pure UEFI mode, which is necessary for Secure Boot and modern OS installations like Windows 11. After disabling CSM, Secure Boot can be enabled, and only GPT partitioned drives will boot. If disabling CSM is not sticking, a workaround is disabling Secure Boot first, then turning off CSM, and then enabling Secure Boot again after saving changes. If the system BIOS does not show the option to disable CSM, it might be locked by the manufacturer or dependent on other settings. This procedure is common across many PCs but can vary slightly by motherboard manufacturer and BIOS version.
