[Q] How to upgrade or flash my LG-KU5900 smart phone?

Guys,
Yesterday my cousin, who lives in Korea, gave me his old LG-KU5900 smartphone.
Phone is good. Has 1 GB internal storage, has a 5.5 GB SD card along with it.
But problem is I cannot install WhatsApp on it because it when I try to install, it says that my current Android version is not compatible.
The current Android version on this phone is Android 2.2.2.
How can I be able to install WhatsApp on it and if not then can I upgrade it using some tool/procedure?
I have previously flashed/installed custom ROMS on my HTC set, but don't know how to do that for LG.

Can someone please guide. Many thanks in advance.

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