Unhappy [Q] s4 mini duos cant rigester on 2G networks

i buy a s4 mimi duos then i changed the software and imei number to unlock turkey sim. now. the new software cant rigester 2g netwrks easly.. it needs to strng networks... 3g networks sigester easly. help me to solve this problem please.
my phone information:
baseband version : I9192XXUAMH3
android version : 4.2.2
kernal version: 3.4.0
build number : JDQ39.I9192XXUAMF7