Lenovo ideapad 300S-14ISK User Manual page 26

Chapter 4. Troubleshooting
When do I need to change the boot mode?
The default boot mode for your computer is UEFI mode. If you need to
install a legacy operating system, such as Windows, Linux or Dos, etc (that
is, any operating system before Windows 8) on your computer, you must
change the boot mode to Legacy Support. The legacy operating system,
such as Windows, Linux or Dos, etc cannot be installed if you don't change
the boot mode.
Getting help
How can I contact the customer support center?
See "Chapter 3. Getting help and service" in the Lenovo Safety and General
Information Guide.
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