"Sony plans to discontinue the Xperia X and Xperia X Compact."
...
"Instead, Sony confirmed plans to strengthen its focus on its flagship lineup with the Xperia XZ Premium and its mid-range lineup, which includes the Xperia XA1 and XA1 Ultra."
...
http://phandroid.com/2017/05/24/sony...eria-x-lineup/


Note: These were only some of the models supported by the open device program:
https://developer.sonymobile.com/ope...and-resources/