Hi, ok I received my F510S from ebay, phone has 2GB not 3GB Ram, I don`t know how I can check if it is DDR4 or DDR3 but phone upgraded via OTA to ndroid 6.0.1 without any problems , by atantutu benchmark shows 77219 points so I`m impressed ;) especially I had before ZTE Nubia Z9 Max with same...