how to Change IMEI number on MTK Tecno devices running android 6.0 marshmallow
1. First before we begin, Download MTK Engineer Mode Plus from this link
2. If download is successful, install and launch the application, as shown on the screenshot below select phone information.
3. you will be taken to the next phase, where you have to select the SIM you would be changing IMEI for, if it is for SIM1 then choose Phone 1 and if it is for SIM2 then choose Phone 2
4. lets say you are changing the IMEI of SIM1, then all you have to do is tap on phone 1 and you will see an empty space where you can make your input after the "+" sign type any alphabet like "E" and you will see something like one in the screenshot below.
5. If you are changing the one for sim1 select the first one with AT+EGMR=1,7,"PUT YOUR IMEI IN HERE " after entering your IMEI within ("") give a space after AT(SPACE)+EGMR...
And if your are changing for Sim2 select the second one with AT+EGMR=1,10,"PUT YOUR IMEI IN HERE " after entering your IMEI within ("") give a space after AT(SPACE)+EGMR...
6. after which tap on send at command and reboot your device OR toggle off and on the airplane mode while on the same screen.
Thats all, check if this tweak was effective by dialing *#06#