Can't change BIOS settings

Aug 19, 2018
I want to enable Intel virtualization on my laptop but every time I change the bios settings and restart, the changes revert back.
I took my Lenovo z50 70 to a repair guy and he told me there wasn't any problem with the cmos battery as the dates were working fine.

What do you guys think is the problem and what should I do?

System is dual booted.
Bios version : 9BCN25WW
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