SidReighn:
XS++ cannot apply patches. Use SETool2 Lite instead. The correct steps are written in first post of this thread. But first read this: General Information about Patch-Unlocking (start here if you want to unlock)

The flash themes aren't working probably because your phone is branded. First unbrand it with XS++. In tutorials and guides section you will find the tutorial.

kendo2748:
It should work with branded firmware as well, but if it doesn't works, then try to unbrand the phone first. By the way what message do you get? Insert correct SIM?