Which rom? Pumpkin car radio

Hello everybody,

I had read a lot of hours which rom is the right for my pumpkin rk 3188 (MTCC KLD6 v 2.96), at the moment is installed Android 5.1.1.

Could you post a link for me which is the right? I had read that the MTCB=MTCC, is that right??

Is this the right? http://ift.tt/2dqoWQz

I need Android 5.1.1 again.

I need viber4android for my subwoofer. I can't choose any settings at the moment with the stock rom. My root attaches are fail.

Befor I flash the new rom, can I Backup the complete radio? E.G I don't like the custom rom.

I hope really you unterstand me a little bit :)

Thanks

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