Hackintosh Acer Aspire E5-772G-56CZ

Hello! I am only a beginner. I have installed El Capitan on my Acer laptop. But, unfortunately, I have a rather big problem with graphics. There is locked InsydeH20 v1.14 UEFI BIOS installed on my laptop. So, I can`t change the setting of DVMT pre-allocated memory size(32mb) even with EFI-shell. I am trying to use the patch for framebuffer, but have no result. Please, help me. I am afraid to mod my bios.

My laptop configuration:

Intel core i5-5200u (hd graphics 5500)
8gb DDR3L 1600MHz...

Hackintosh Acer Aspire E5-772G-56CZ