Sony Mobile has updated the Xperia X Concept firmware to build number 38.3.1.A.0.74, which introduces the aptX Bluetooth code. This means that you can now take advantage of hi-res audio, especially if you don’t own a pair of headphones with LDAC support. As well as aptX support, the update also includes the latest 5 March 2017 Google security patch. The update is rolling to the experimental track of the Xperia X Concept.
Thanks Josef!