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Re: Upgrade Android 4.0.4 to Kitkat.
Do some research. You will need to see if developers have put together a KitKat ROM for your device. If they have, then you will have to research for the method to root your phone first in order to install the ROM onto it.
And if any of this doesn't make sense - do some research to learn what rooting is, what a ROM is, and why you perhaps should just buy a newer phone rather then trying to put the latest version of Android on an older device... research costs you nothing but time. If you don't know what you're doing you may have to buy a new phone anyway. Rooting can turn your phone into a completely unusable chuck of plastic and glass, especially if you're careless or don't know what you're doing. So I will repeat myself - do some reading FIRST!