How can i install android 4.4 into alcatel ontouch snap 7025X (mediatek mt6589) ??

Hi.......
I can't update my alcatel one touch snap 7025X from android 4.2 to 4.4
please help How can i install kitkat rom into my phone ?
INFO:
"mediatek mt6589
4x ARM Cortex-A7 @ 1.21 GHz"
"Ram 1G"
"GPU PowerVR SGX 544MP"