android upgrade firmware

hi, i have a walton primo n1 android phone. its comes with android 4.1.2. phone specification please google coz cant post link as new user
i got its firmware in a forum. for nink please google for Walton Primo N1 Software, Flashtools and Drivers [ Update & Bugfixed ] coz cant post link as new user
in my phone there is no upgrade option. please tell me how can i edit this firmware to remove 4.1.2 and add 4.4. i messege many here in xda who post about custom rom. but no answer. ma b they actualy dont know how n wat to do. they use copy paste from another forum. by the way if anyone know how to do please tell me. just tell me which file i replace via Cygwin/kitchen?

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