Hello russians. I follow your topic
and I realize that you want to try 2.3.6 rom. I know that 2.3.6 rom doesn’t recognize your sim card, but here is solution:
Replace libcm.so in lib folder from your android 4.0.4 to any android 2.3.6 rom. And if you are doualsim card, then add at the end of build.prop this:
And for firefox os:
THe firefox os I gave can;t brick your phone because it won;t flash 3e recovery. So you will not ruin your phone flashing mine firefox os.