Turn off the Lenovo laptop or desktop
Turn it on and immediately press F1 repeatedly
If F1 does not work, try F2 repeatedly
On some Lenovo models, press the Novo button instead
Select BIOS Setup from the Novo menu
If using Windows, go to Settings
Open Recovery
Under Advanced startup, select Restart now
Choose Troubleshoot
Select Advanced options
Select UEFI Firmware Settings
Click Restart