bios problem

Pegatron motherboaed is new for me....need someone to help I tried Esc, f2, f10 many times but I couldn't get that. My mother board is Pegatron H87-M1 Bios Version - American Megatrends Inc. Bios Mode - Legacy Rest of my specs, Windows 10 CPU: Intel i5- 4570 3.20 GHz RAM: 8GB

I have an old gaming laptop here from an unknown manufacturer that I'm trying to clean up, It was custom made back in 2014 or so and has no external MSI markings or Asus markings. I'm trying to update the BIOS installed which is the AMIBIOS version E1757IG6.719 dated 03/14/2014. However, the...