problem i747m pls help

yacbob said:

hello everyone , i'm new in this forum and i will appreciate any help from your part to help solve my problem
i have samsung galaxy s3 canadian version unlocked sgh-i747m , i'm using it in Algeria in my local network , i was using android 4.1.2 and everything were fine until i updated the firmware via kies to 4.3 everything work fine except some ussd codes like when i try to view my balance i dial *200# and i got the message " connection problem or wrong mmi code " i tried to put comma after # but doesn't solve the problem , i tried to downgrade to 4.1.2 but impossible as well ,
i found a way that may be the solution which is changing the CSC of the phone but all the application available need root access and i couldn't root the device via odin and autoroot file provided in the net it say pass at the end of the root process but supersu won't install and when i check with root checker it says the device is not rooted , i download root explorer but it's a bit complicated for me to use it , so any on how to root the phone or change the CSC without rooting , or downgrade back to 4.1.2 or or just solve the problem of the mmi code

Click to expand...

Click to collapse

yacbob said:

i managed to root the phone and i tried csc changer application but i doesn't work cause i found only 3 csc installed for the 3 major network in canada which are roger fido and bell , i tried all of them but still the same problem , i'm really stuck , i think i'm going to try kitkat 4.4 custom rom from cwm , anyone tried it so far so he can feed us back , or anyone knows where to find the csc for Algeria so i try to add it to the csc list in the phone ,

Click to expand...

Click to collapse