Need solution to repair imei oppo a71 2018 (urgent!!!)

Please help me to write IMEI Oppo A71 2018. the problem is my IMEI becoming null after flash . I have searching for this problem but there is no solution for this model, also i have searching to enable diag mode with * # 801 # but it doesn't work. and my last question is, is it possible to root this devices? Please I hope there is a way to solve my problem and i am very grateful if you help me and tell me how to solve this problem. Thankyou

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