How do I unlock Advanced BIOS menu in Acer Nitro 5? AN515-43-R3JU

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Hello There!
I have been using Acer Nitro 5 for few months. Its very good. 
But A problem is there, i.e, System Reserved 2.1Gb of 8gb ram which results in 5.9gb usable out of 8gb (Results in shuttering/Framedrops in Games). I want to unlock Advanced BIOS in my Acer Nitro 5 (AN515-43) to change shared memory or UMA Frame buffer size. I tried to access advanced bios with several other Acer device Product's key combinations. But no luck. I just want to change Shared memory size to make atleast 7Gb of ram usable. I'm In a position that I cant buy any thing else. So please tell me the key combination to unlock advanced settings.


Cheers. 

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