I have a K770i CID53 and want to debrand it in a few days. This isn't the problem.

My questions is:
If I want to take the branded Main and FS back to the phone (it has a o2 Germany Branding)
I need both files. I don't have them now.
Is it possible to extract both files from my cellphone?
At the moment it has the branded firmware.

Do I need both files (FS and Main) to rebrand ist or do I need only the FS file?

Hope the topsony members would help me :)