[Q] can we update IMEI number in the ROM before installing it

hallo, i have flashed my Lava Iris 405 plus with 4.4.2 kitkat last year and since i haven't got any rooting method for this firmware, I'm not able to update my IMEI numbers.
i wanted to know if there's a way to update IMEI numbers to a firmware before installing it to my phone?
that means some way to make it permanent that i don't need to root it over and over again every time to insert IMEI numbers.
thanks

Lava Iris 405 Plus 4.4.2 kitkat

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