Help needed in porting stock 4.2.2 rom into stock 4.4 rom for mtk6572 !!!

Hi Friends,
I am pretty n00b in rom porting. I simply want to upgrade this Phone http://www.iball.co.in/Product/Andi-4-5z/578"]http://www.iball.co.in/Product/Andi-4-5z/578
IBall Andi 4.5Z having jellybean rom to any simply any Kitkat based rom.

I found out that this phone http://www.iball.co.in/Product/Andi4-5-K6/597 IBall Andi 4.5K6 has almost same specs and same mtk6572 chip.

I Downloaded both the stock roms so that I can try porting my self using porting guides.But most of the guides explain using folders but in these roms there are all .img files. Screenshots Below
[IMG="IBAll Andi 4.5K6+ Kitkat"][/IMG]


[IMG="IBall Andi 4.5Z JellyBean"][/IMG]

extracting them using winrar, 7zip , Uniextract failed. :eek:
What to do now ??:confused:
how to get these rom ported ? i Dont want much but to simply upgrade my phone to Kitkat whether be in stock or custom rom.

Links to roms are provided below.

http://www.androot.org/iball-stock-r...-firmware.html

http://www.androot.org/iball-stock-r...-firmware.html


Please Help me.