After a short test, on my mi2s 32gb also both camera work now! :)
Only my provider is not shown correctly (t-mobil instead of congster), but that is not so important for me...
I tried to flash a old radio (3.2.8) with cwm, but the baseband version did not change under phone information.
1. wipe data
2. flash radio in system 1
Is there a other way to flash a old radio?