This thread may help
https://devtalk.nvidia.com/default/topic/1006749/jetson-tx2/problem-with-wlan0-on-jetson-tx2/
If it still doesn’t work, post the output of some of the debugging information asked for in that thread.
A few other questions:
was it working before you changed the dtb?
are you using the development board carrier?
you say you have a carrier that requires wifi, is that also the development board carrier or another type?
I have an orbitty carrier board for the TX2 and it is using wifi for networking without issues.