help with w810

hi all

been tring to repair a w810i for weeks. so far i have xs++ working with the phone. the phone had a wsod problem. ive have it working now. i managed to copy a gdfs from a working w810i then flashed it to the wsod w810i but unfortuanatly its not working with my sim. im still not sure what im doing exactly. ive read allot so far and a little simple advice is what im after.

what is the gdfs and what does it do ( so far i think its the main boot?)

main flash (whats it do, so far i think thahst to do with layout of flash menu?)

file system (whats it do?)

how do i customise my phone so as not to have any operator crap just mods i think are cool?

its a db2010 cid49 red if that helps

all comments apreciated