Unknown Baseband,Imei and insert Sim Card Error

Okay so I have an SG-i9300 I flashed a custom ROM and after the flash it couldn't detect my same and the baseband and imei are showing unknown. I later flashed temasek's rom which apparently works and I can use my sim and stuff but the problem is every other ROM that I flash gives the same unknown base band error. So can anyone please tell me how to get the baseband.


P.S: I reflashed my EFS on the other ROMs but they didn't work.

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