Last week ZTE’s nubia brand confirmed that it will introduce its flagship Z20 smartphone in China on August 8th. Today a phone with the model number NX627J has been certified by TENAA in China, which should be Z20. It shows dual displays, similar to the nubia X that was introduced last year, but this will feature a slight larger 6.42-inch FHD+ OLED screen on the front and the 5.1-inch secondary OLED display on the back will have FHD+ resolution, compared to HD+ screen on the nubia X.