Look you can`t downgrade your cid number only upgrade to higher.
How to debrand:

XS++ 3.1 Guide-Flashing,Customizing,Recovering

or

Flash your phone and How to apply or remove patch using SETool 2 Lite

Here are some description:

CDA ( custom files )

and

Languages

All files are in download section. But first read this:

How to get access to download section

and

Forum Rules

Nice day