Restart the computer
Enter the BIOS/UEFI setup during startup
Open the Boot, Security, or Authentication menu
Find the Secure Boot setting
Set Secure Boot to Disabled or Off
Save the changes and exit
Restart the computer
If Secure Boot is grayed out, set an administrator/supervisor password in BIOS/UEFI first
If required, switch the boot mode from UEFI to Legacy/CSM
If required, confirm the Secure Boot key or platform mode change before saving