Default Where is wifi module?

I can't find /system/lib/modules.

Where is it?

I need dhd.ko to load wifi drivier for my experiment.

On galaxy s4, I can load wifi driver using this command; "insmod dhd.ko".

How can I do this on galaxy s5?

To find wifi driver (dhd.ko), I built the kernel source, but I couldn't find it.

My purpose is to use wifi and LTE simultaneously.

I can do this on galaxy s4.

Please help me.