Can anyone explain me step by step how can it be done?

Ok i will introduce my problem.
I have w800 main FW (EMEA) and FS(EMEA6) and custom pack but they are CID36 and all new k750 phones are CID49 I have heard that it can be done by gslide i mean changing my CID36 FW and FS to CID49.

Now how to this? what header i have to use and in general please step by step.

Thanks in advance.