Your just like me back then. Cust.. Its just like a "backup" idon't know. but if your 100% sure on upgrading ur phone,
And Use loaders (like me) my version (past) is v10B. (btw my cp is km555e) then i upgrade it to v10K.
or you can also download v10D. :) your choice.
here is the tutorial :
http://www.mylgcookieclubby.smffy.com/index.php?topic=37.0Then DOWNLOAD KM555e UTILS. so ull know more abt the cust.. And youll be needing WINIMAGE.
(btw if you upgrade ur version to either v10d or v10k, this versions is not pre-themed. so the next step, go pm and expert here and ask for help. :) all i can say is to upgrade first..) :D
-lol. just trying my best to help :P