S4 mini won't update

[Chrf]

I really need help with this, my Samsung Galaxy s4 mini is stuck on 4.2.2 and I've read up on my phone and apparently it's upgradeable to kitkat. Samsung kies has also failed me and I don't know how to figure this out. I have the SGH-I257M.
Any help would be appreciated!

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[B. Diddy]

Try flashing the stock firmware via Odin: http://forums.androidcentral.com/am...w-flash-stock-rom-via-odin-new-interface.html. Find the proper firmware here: Firmwares - SamMobile