Edited by rudra964 at 2017-04-02 15:44
There is no need for you to do these things. And I didn't say that this will change your imei and sn, but that you will lose imei and sn and won't be able to call or text or use internet. Just set it to world mode and 12 instead of 11. And no CDMA can never be disabled on any phone and also this cannot be changed back to TDD & FDD LTE.

well that won't change ur imei or sn number. if you change that ur rx single will be restart nd,if the option isn't supported for your country u won't get signal to use data or u can't call even u get full signal.I aware that this was designed for world mode or dual mode namely CDMA I know the process but I'm asking is their any way to set that as fdd, tdd nd deactivate the CDMA mode

Hey, this has been changed in the new firmwares. Do not tinker with MediaTek's Engineering mode if you don't know what you are doing. You will lose your IMEI, SN number if you modify any of  these settings.