Downgrade MM to Lollipop 5.0.2 on G9200 is it possible? - Galaxy S6 Q&A, Help & Troubleshooting

Dear,
I've a S6 dualsim g9200 version with Marshmallow stock firmware.
I need to use a 3g Videocall but in this firmware 6.0.1 and in the 5.1.1 there aren't this option.
I believe and hope that there is in 5.0.2. Anybody can conferm this feature?
And if there is in 5.0.2 can I downgrade to 5.0.2?
thanks a lot in advance

You can't downgrade it.
The video call is depends on CSC I think.

There is something that I don't understand. In 5.1.1 there isn't how to make a videocall by the button on the dialer, but there is an option in other settings that can permit to doesn't show video in videocall.
Is there any solution to enable this option eventually?

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