Tablet [Q] Android 4.2.2 for RK2928??

I found out that Android 4.2.2 can run on Rockchip RK2928 since there's another tablet with Android 4.2.2 and RK2928 in it.
I own Penta WS707C Tablet which has RK2928 and Android 4.1.1
So, I want to install Android 4.2.2 on this.
Is it possible? If yes, then where can I get it's image file?

Please help.