About enabling 4g in 3g in mmx A120 via engineer mode

I Want to operate jio 4G in my 3G micromax a120. So i tried to do engineer mode>>network selecting>>4G/3G/2G auto. But it does't accepting 4G/3G/2G auto and forcibly select to default i.e. GSM/WCDMA(preferred). How can I enable 4G ? Please help.

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