I have c702 from o2 uk.Can i change language for polish and keep o2 settings and branding?
What combination of files should i use?

Example:
C702_R3BA035_FS_CENTRAL-EUROPE_RED52
C702_R3BA035_MAIN_GENERIC_NG_RED52
C702_1208-6126_R5A_O2_United_Kingdom
Can i use combination like this?
Fs file is responsible for language section?
Main file for phone software?
Cust pack for 02 settings and branding?
Can i mix central europefs with english custpack?
If someone can answare or explain what this file are responsible for and what cmobination are allowed.
Thanks