for all you people, if you ever get in same situation:
Phone was moisture damaged. I didnt get it wet, but there are 2 possibilities:
1. a friend told me that all the shipped phones, compared to the air cargo phones, get damaged no matter how good protection is. If they are shipped to your country from the land of origin, they are most probably water damaged already. Being that I live in Serbia, and all the importers of goods use ships instead of air cargo (big price difference), my phone may be water damaged before ever turned on.
2. it was a ridiculous weather in Belgrade, with minus temperatures in March, so a simple condensation may have damaged the phone.
Service shops CAN repair the phone if it was moisture damaged instead of immersed, because air moisture damages only certain electrical circuits, instead of the whole board. My phone is at a service shop now, and the guy is inspecting the damaged circuit. It can be restored, and if the damage is high it would require replacement of the circuit which is kinda tricky cause it requires very similar board like the one LG L9 has, for harvesting.
If anyone maybe somehow finds a working SIM free motherboard for LG L9, please let me know cause I cant find it online. Just one ebay entry with "works but has issue" which I wont buy.