So she's finally alive!
After I installed the memory that came, I had the board working for one time, but then I got the same parity or it kinda booted but soon after the "American Megatrends" logo it then displayed "CMOS INOPERATIONAL SYSTEM HALTED".
So I've read some threads here about regenerating old dallas chips and using them in 286 boards... so I did and it worked right away. It stores the settings, and it runs to the boot screen.
Unfortunately my know-working IDE/FDD controller refuses to work with this board, kinda bummer (everything connectred properly, and FDD light always ON, HDD not booting, when there is a SD->CF adapter then no boot at all). I will try another IO card other day.
As for now I post the photos of this success, it wouldn't be without you guys, thank you all so much!