IdeaPad U300s boots so fast I can't press F2 to enter BIOS
When the U300s is configued for fast boot in BIOS, the time on the startup screen is minimal and the Press F2 for BIOS and F12 for startup device selection may not be displayed. It may be difficult to then enter BIOS - how do you get back in?
One way is to shut down the system, and then press the OKR or OneKeyRecovery button on the left side. This button looks like an upside down U on it and can be seen on the side, below the power button in the photo below.
Pressing this button will bring up a selection menu like the one shown below. Options to perform system recovery, select boot device menu (same as F12) and enter BIOS (same as F2) can be selected. The BIOS can be easily entered this way.