Default N7100 losts it's IMEI after flashing stosck 4.1.2 via odin

Helo everybody..

I have a problem with my device.. in the past i had lost my Imei but i restored and evrthng was ok.. But when i flash via odin a stock 4.1.2 it losts it's imei, and i have ti root it again and again to restore it..
Can someone help me??????

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