XA F3111 FIRMWARE ANDROID 6.0 33.2A.470  download
Xperia xa is new sony android smart phone have the capacity of 2gb ram and work on media-teck mtk platform and 13 mega pixel camera with android 6.0 platform
as a service guider i don,t describe more about its future
You can update or restore (boot loop /stuck logo) your firmware of this modal in two manner
1-manually using sony pc companion (better for customer ) download from here   follow the guidness
show in app but it take a long to complete the whole process
2-using flash tool (better for professional services)

                                          How to flash using flash tool

1-download and install flashtool
3-install usb driver (must else can't flash) from C/flashtool/driver
4-download XA F3111 FIRMWARE ANDROID 6.0 33.2A.470 from here skip 3 second add redirect using shortent link
5-copy the downloaded file in to c/flashtool/firmware
6-open flashtool click on flash logo and choose your model tick on wipe data and no final verification 
7-turn off your phone and connect phone by pressing volume down button
8 wait until the whole process is complete .after long press power button to restart to normal mode