Okay, so I did it!
I installed macOS mojave on this laptop.
Keyboard's working, backlight keyboard working audio is working ethernet is working, even one external wi-fi dongle is working after i installed the driver.
My only problem is that... the trackpad doesn't work!
Tried voodops2trackpad, voodo12c, appleps2smarttouchpad and a few more...
The trackpad is not even recognized in system preferences - trackpad.
Any ideas what should I do in order to make it work?