This problem always come up when you upgrade your Tecno H6 to 5gig and also happen when you install custom rom meant for Tecno H6 using 2gig  you tend to get the Invalid IMEI errors you can fix it by flashing a Custom rom meant for 5gig or Flash this Zip file

How To Fix the Invalid IMEI

1. First, install this recovery for Tecno 5gig Download 
2. Download this HERE, renamed it to update, it a zip file, so don’t touch the extension “zip”
3. Place the download file in the Root of your Sdcard
4. Boot to your Recovery Mode (shut down your device then press power button together with Volume up same time)
5. Flash the Update file and Reboot

Congratulation You have fix the Invalid problem

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