Go to Security > Secure Boot > Disable. Then go to Startup > UEFI/Legacy Boot > Set to "Both". Note: Booting in Legacy mode may break your existing Windows install.
If a Supervisor Password is set and forgotten, the motherboard may need to be replaced, as Lenovo does not provide a "backdoor" for security reasons. Black Screen After Update:
: Under Config > Display , you can switch between Hybrid Graphics (for battery saving) and Discrete Graphics (for maximum performance in CAD/rendering).