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I successully repaired my imei number through maui meta 3g and phone working fine with both sim but i don’t know how to repair serial number problem where serial number is written either it is SN or PN or both where i find it on box or on back of phone. test point redmi note 4 mtk nikel . test point redmi note 4 mtk nikel and some where i found that serial number is 18 digit where 18 digit write on mobile or