very simple really, if you want to transfer the cfw save file to your online enabled ps3 all you have to do is:
find the save file you want to use
transfer it over to your cfw ps3 via ftp (i am sure you know how to do this if not the instructions are usually in the topic where you found the save file)
load up the game and save.
exit the game after saving and go to your save game utility
copy the recently saved file to your usb stick (make sure to backup your original save file before you do this because it will overwrite your original previous save file on your usb stick if you have any on there)
plug in the usb stick into your online enabled ps3 and turn the console on
go to save data utility, usb pen drive, and copy the save file over that you recently saved from your cfw ps3, make sure that the save file on your online enabled ps3 is backed up too if you are not bothered about the save file then overwrite, if not copy the original save file to your pc before you overwrite. (it's best to backup any original save files that you wish to keep to your pc so you don't overwrite them by accident before using this guide)
now load up the same game that you loaded on your cfw ps3 and the trophies should pop up, when they have finished popping, press the ps button to sync them and you are done

.
just a warning there are some cfw save files that cannot be copied over to normal ps3s like copy protected save files as it has a encrypted files that makes it impossible to transfer it to anywhere (they can only be moved and backed up on a cfw ps3), even if you transfer the the copy protected save file from a cfw ps3 to a usb pen drive and then copy it to your legit ps3 it will say "copying is prohibited" so don't waste your time.
also some cfw save files will corrupt as soon as you try to save over them, these files can not be copied over as it will just say the "file is corrupt" and will stop working there is nothing you can do about it and there is currently no work around to bypass this, however the save files that do corrupt can only be used on cfw ps3s and cannot be copied anywhere else, you can still get trophies from these types of save files but you can't use them on any online enabled ps3 or copy them to any online enabled ps3, i wouldn't waste your time with these type of files because you cannot sync these trophies as they will be stuck on your cfw ps3.
anyways i hope that made sense and i hope it's helpful.
---------- Post added at 06:56 PM ---------- Previous post was at 06:49 PM ----------
Originally posted by mikie
2. - then to get this all work i need ofcourse cfw wich is best for this what im doing or wanna do
rebug cfw, don't waste your time with the 3.55.2 cfw get the 3.55.1 version, it's more stable.
3. - and whats the best ps3 to do it with because i have slims ps3 does this matter
you have a slim so that should be ok, there are a few models that have problems with cfw but i don't know a lot about this, google it and that should give you more info.
4. - And how does this downgrading stuff work to a lower firmware so i can istal the custom one
go to ps3hax and there should be some info there about downgrading, i'm not a expert on this.
5. - And if i installed cfw can i update again too ofw after a wile if i want that
yes you can go back to official firmware if you wish.
s
answers in bold.