Sony Mobile has released a new update for the Xperia XA Dual with build number 33.2.B.3.105, which includes Google Security patches to 5 September 2016. The previous update (33.2.B.3.81) had security patches to 1 August 2016.
Strangely, the update has a very limited release. It is only available on one Xperia XA Dual variant (F3116) and, so far, only into one region (India). We hope to see the update widen into other variants, including the single SIM models and will update you once that happens. In the meantime, you can download the FTF firmware file below if you run a F3116 model.
DOWNLOAD Android 6.0 FTF Firmware File: Xperia XA Dual (F3116) 33.2.B.3.105 India Generic