Lg g pro can`t update

Hi everybody,
I have a problem with my LG G PRO.I got it from china and it is an f240 model.
Probably f240l I guess,but I have no option to check for software updates in the about section.
This means my rom is a custom rom without the option to update?Or can I fix this?
How could I flash the stock kitkat rom on this version?
Thank you very much for your time.

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