Dial *#*#83781#*#* on your iTel smartphone, then a screen title “ Engineer Mode ” would show automatically.
Scroll Down and Select “ Set IMEI“. the phone should display your IMEI(s).
Change all or any of the IMEI being displayed with the one you want and then, Click “ Set IMEI“.
A confirmation message will pop-up, Click OK and Reboot the Phone. once the phone is rebooted,
Congratulation your iTEL android device IMEI should now be changed and you can try any tweak you want.