Tried reinstalling drivers about 20 times;
Tried on another computer still the same;
Tried other (not LG) cable still the same
Today I was at local service center, they said that they cant fix it, so they sent my phone to a better service and they have some kind of box mobile phone fixing tool. Looking forward, that costs 10 to 15 euros. hopefully they fix it.
and before you do anything to your phone
read the side effects also!