Lenovo IdeaPad S510p Touch Notebook - Manual (Page 30)

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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 Windows operating system (that is, any operating system
before Windows 8) on your computer, you must change the boot mode to
Legacy Support
. The legacy Windows operating system 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” of the Lenovo Safety and General
Information Guide.