No Cellular Network on Dual Sim Stock Only Single Rom

Greetings here's my problem. I have General Mobile 4G with Dual Sim.Recently i tried crackling twrp and cm 13 official.The cellular network worked without problem.There was 2 sim slot and it was getting LTE. Then i wanted to turn to stock seed rom. After the boot and install section on my device i can see 2 sim slot but i cant get any cellular network. I can make and receive messages,calls. If i install Single Sim stock rom, then it receives cellular net. Please help me about this