From the Lenovo Support Web site

Follow the instructions to update the UEFI BIOS from the Lenovo Support Web site.

  1. Go to https://pcsupport.lenovo.com and select the entry for your computer.
  2. Click Drivers & Software > Manual Update > BIOS/UEFI.
  3. Follow the on-screen instructions to download and install the latest UEFI BIOS update package.