[Q] Installing ROM on MTK6575

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http://forum.xda-developers.com – Hello, I'm new to flashing and installing ROM on android phones. I enabled root in this phone. I wanted to install JellyBean 4.2.2. After a long search on the internet and a lot of trying I decided to open a thread here. My phone is Star N800 MTK6575 with Android 4.0.4. When I tried to install ROM through recovery mode it showed me this: "Failed to verify whole-file signature" I tried to install ClockWorkMode Recovery without success SP flash tool and Odin also disappointed me.. Could anyone help me please? Maybe I did something wrong, can you please explain me step (HowTos)