@György-Farkas Thank you so much. You really save alot of my time. I found UART2 on this pins and some other GPIOs.
If you don't mind, I will share updated file, then @J-Tech can update it in his version. I din't check rest of pins. I found what I need and now I can use uart2 and for example second ethernet port :).
https://drive.google.com/open?id=1QDuor03V4BJN5V6oLVEPM2RSqHu97-pq

Hi, communiti members and support,
I found a that in shcematic of omega2+ exist some GPIOs what really not exist in real board.
I thought that maybe this is just mistake but when I found /deb/ttyS2 (GPIO20,GPIO21) I realized this pins should be in another place.
Then I found on the back side of omega2(+) one didn't solpered smd 50pin connector. As I undestand it was made mainly for developers needs. But, I'm prety sure that this connector has all pins what shown on the shematic placed on github.
Does anybody can provide me a pins description, or I need to do my own researcesh. Just it's uncomfortable to do research while omega2 is placed bottom-up, also it got alot of connected wireles to make it run.
Regards.