Problem solved! After trying to find new drivers, that don’t exist, browsing forums and tried all stupid advices - clean the power supply jack, readjust screen resolution and screen refresh rate etc., finally I just went to Device Manager and check the driver, and just find that there was evidently new driver installed before the purchase (probably because my model is with the new FHD LED Display, so I have an option to “roll back the old driver”, which I did and “voila” – no more flickering, picture is perfect!