mobile

I have a SCH-I939D(dual sim, with carrier plan but is now ended). Which is a variation of GT-I9300. I am trying to flash a custom rom to it. But i cannot find any. There are also no thread/forum about this device. I flashed a rom designed for I9300. And found that all features are working like a charm EXCEPT the Mobile Network. I found that the problem is caused by Kernel, probably because the lack of drivers. Flashing the modem or backed up EFS does not work. Now I got back to the stock rom.My question is: Is there any way to get the Network working without flashing another kernel? Thanks(sorry for the bad english)