What would you recommend an alternative firmware for dvuhsimochnika?

Question

Android

There is HTC Desire SV on Android 4.0.4.
There is a wish that - a thread as much as possible adapted for dual-sim.

Answer 1

And why do you need the firmware, put a dialer adapted for 2 SIM cards and all the cases, I personally use this one .

Answer 2

I want something new thread already in the system :)
And about 2-sim cards just as the main wish.