I have an galaxy s4(9505) and where I live (in my city) we dont have LTE signal.
So, to have better battery life, I change the network to use 3G/WCDMA only.
But with the custom kit kat rom's, when I try to change the conection, I get the error "the proccess com.android.phone stopped".
At the moment im using the cyanhacker v3, and my baseband is the MJ6.
I saw this error using gummy version, cyanogen mod, madhi rom.
Im using the bootloader of the 4.3 official.