TomatoUSB

Hi,
I would like to copy the Tomato firmware that was installed on a Asus RT-AC66u router to an identical Asus modem and keeping the settings.
So actually just make an identical copy of the firmware of one router to the other router.
On that original tomato modem it contains specific information to reduce the radiation of the wifi signals, so it becomes more safer and doesn't emmit so many signals anymore without losing your speed.

How can this be done please?

thanks in advance!