Shut down the laptop completely
Press the Power button
Immediately press the F2 key repeatedly
Keep pressing F2 until the BIOS screen appears
If F2 does not work, try holding F2 while pressing the Power button
On some Asus models, press the Del key instead
If Windows starts, restart and try again
If Fast Startup is enabled, use Restart instead of Shut down
If needed, enter BIOS from Windows by going to Settings > System > Recovery > Advanced startup > Restart now > Troubleshoot > Advanced options > UEFI Firmware Settings > Restart