how can i cancel update: 8.25.37

My Moto g xt1033 ruining downgraded android 4.4.4 and from 16.05.2016 on opening the mobile, it is showing that System update: 8.25.37 and it is not deleting at any cost.
On installing the same CM Security/antivirus is showing that it is a Trojan Virus and it must be delete. After deleting the same from all angles it is coming again and again. Kindly suggest me, how to rid on this.

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