[Q] Unable to search networks

[proxykid]

Hi,

After flashing one of the CM11 nighties I started getting the message "error while searching for networks" when as msg says searching for networks, I found out too I can't use any USSD code I get the message "Connection problem or invalid MMI code" however I am connected to my local network and able to use LTE.

Flashed the latest modem version and for some time it works but now again it doesn't work, attempted flashing again and issue persists.
Attempted a newer version and switching to Paranoid and issue also persists.

Help?

My device is a SGH-i747m from Telcel (Mexico).

 

[audit13]

Does this happen with a completely stock ROM?

 

[proxykid]

Sorry for late reply, my phone got bricked

Anyway, I was able to use USSD codes again after going back to 4.1.1 stock, therefore the problem is either 4.3 or the modem upgrade which disabled USSD codes.