Rom for mtcb-kd....

Hi, firts of all, thank you for this minutes of your attention, im spanish and im sorry about my english mistakes.

I´ve been searching information in these web but im not sure about what have i got to do because im a "noop" in these unit.
i recently brought a chinese radio android car, and i want to install the WTRP for a backup of the stockrom so i can install roms from these web.

information about my unit;

Model Number: S07
S/N: 000D18A133BC
MCU VERSION: MTCB-KD-V2.81 oct 14 2015 10:38:37
ANDROID VERSION: 4.4.4_28032016
KERNEL VERSION: 3.0.36+ root@chun *599 Wed Mar 23 17:36:28 CST 2016
COMPLITATION NUMBER : rk3066-eng4.4.4 28032016. 11:30:45
CPU: ARM Cortex-A9@1.6ghz (x2)
MEMORY: 1024MB

GPU : MALI 400
RESOLUTION : 1240 X 600


I have two questions;

In these web i´ve seen roms for MTCB-"XXX"....... but i dont find roms for MTCB-"KD" my question is if you can tell me what version can i install??

The other question is ; The radio is already rooted, Why i cannot enter to the develop options for activate the usb debugging, usually on all my android devices i go to "Phone information" , and i press for some times to "compilation number" and the develop option get activate, but on these radiocar unit it doesnt activate. Is there any other options for activate it?

Thank you very much.

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