Nokia X6 CORE (v32) OR CORE (v40)

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Hey i have an old s60v5 phone with me and i hate its lame UI. so Im thinking of flashing this phone to a CFW. Skyfire Belle to be exact .. Im new to flashing and so Im doing a lot of researches and watching alot of tutorials and reading alot of blogs and websites to get the idea straight. but the thing which bugs me is CORE (v32) OR CORE (v40)... both theese core names are given different links to download the specific file of the core. and i dont quite understand how to know whether which one to download or rather find where this core version is on my phone can any of my frends please help me to find it? Im really sick and tired of S60V5 and really need to flash. and this is the problems which keeps me delayed. guys please help me out... answers would be appreciated. thank you in advance