I'm happy to share my rootpack for Xperia XA Ultra Single Sim with you, thanks to @bobenthug for private test. Files are coming from .111 firmware but can be used on other versions.
Rootpack link: https://mega.nz/#!Jt5RwT4S!-EJtjo69t...zWtlEIxviguXAc
Guide link: http://forum.xda-developers.com/xper...-noob-t3430170
Have a nice day