Unknown IMEI & Baseband when using AOSP roms

[almousawi]

Hello,
I have SGSIII with efs v2
Whenever I flash AOSP-based ROM (like CyanogenMod), I lose signal and get unknown IMEI and baseband (getRIL shows that I have known RIL) and when I flash a stock-based ROM everything return to normal
Help please
Thanks,

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[almousawi]

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