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Inspiron 15R (N5110, Early 2011), Windows 10 is not supported

I have DELL laptop of following spec.
Inspiron 15R (N5110, Early 2011)
Service Tag: 6FYR8R1
On clicking Get Windows icon, got message that The BIOS is not supported, Hence windows 10 cannot be updated. In such case, How can update to WINDOWS 10?.