if the themes allready work you don't need to do any software tweaking (but if you apply the patch to move flash themes to card it is easyer) you only need to upload the swf files to FS (I don't know the right path, there is another topic about this for W200i the path is there and also the instructions are there) and thm to the card in Themes. here's the topic:
w200i flash themes - Top Sony Forums