k610i problem patch

[wikopl]

Hi
I am reading here and there, ex.
http://www.topsony.com/forum/phone-x...ing-t6671.html

I understand that XS++ can do the same as SETool2 Lite, right?

But the main question is where do you take those Main Firmware and File System files to flash them to the telephone from?
And when you use a term patch, what exactly do you mean? Is there a list of patches for k610i with a description what they do? I 'only' want to remove a simlock.
And yet the third option, next to MAIN and FS, i.e. flashing customisations.
Who is writing them and what for? Is it that somebody creates something new, don't know what, a new menu? .... and then s/he wants to share it with other users and publishes this customisation as a patch?
It seems I am able to use these tools (managed to backup my GDFS and move EROM CID from 49 to 52 but I am stuck after that).
Thanks in advance for any clues