My tecno C8 V1 with build number C8-H352-A2-L-20160118, keeps experiencing this problems of showing invalid imei whenever i try to tweak the imei, i used chamelophon to tweak the imei since V1 of tecno C8 dose not have CDS option on the engineering mode but after roobing it shows invalid imei which will totally be restore to the old imei when you format the phone from the chinese recovery option, please how do i rectify the problem and change my imei to a new imei, please help.
