Sony xperia z2 D6503 Sim card not working ?

Dear friends my phone mode sony xperia z2 . after flash my phone (android 5 to android 6) using flash tool ( D6503_23.5.A.1.291_1281-1983_R3D.ftf ). Show me no sim card only emergency call . I when i use android 5 that this works it fine but now no working . wifi is good now and others apk working good ?
Any body give me solution please how can i solved it ? IMEI number is ok its show me .

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