My Gateway NV57h has an ACER in BIOS - can I fix this?

Hi Everyone, I'm new here and have an "Is this possible" type question. I bought a used Gateway NV57h laptop on eBay but when it arrived the BIOS has the manufacturer listed as ACER and the model is Aspire 5750. I thought using a Gateway downloaded BIOS would fix it back to Gateway, but it still says Acer (yes, I realize that this is really an Acer in disguise). Anyway, I am thinking that someone has put an ACER motherboard in this machine. Is this fixable using some sort of BIOS mod or is this ACER "hard-wired" into the motherboard itself? Besides the ACER logo on bootup, I find that my "special function" keys don't do what they're supposed to (like brightness up/dn) but rather follow an ACER keyboard layout which isn't quite the same.

Thanks in advance for your comments!
Doug