[Q] Efs folder & IMEI?

Hi, i am an owner of a tmobile galaxy s3. I am currently running P.A.C man rom on it and everything is fine. But the thing is... I never backed up my /efs folder (it is empty now..) for the imei, and now i want to flash back to OTA firmware. Ive saw some people saying that they lost their IMEI after they flashed back to OTA.. So what do I do now? I dont want to ruin my phone.
Thanks in advance.

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