[Q] repair , and Change , IMEI number

hi friends , please help me , how to repair , and Change , IMEI number in android 5.0 for tablet Fonepad 7 ME372CG , because after downgrade of android 5.0 to android 4.4.2 and upgrade of android 4.4.2 to android 5.0, has changed IMEI my tablet , and I have Non-MTK device , thank you

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