well, I've done some stupidity, as we all need to do from time to time
Rear right door did not want to open from OUTSIDE and stupidly enough, I opened them from inside and thought, well, maybe the "children lock" somehow engaged. And I switched the children lock switcher to another position.
And I closed the door...awwwwwww, as they shut closed, I hissed long "Fuc**!!!#$&#!"
Of course, now I cannot open door neither from inside (children lock ON), neither from outside (something broke obviously).
Any idea how to disassemble or open doors intestines while they are closed?