Default [Q] cannot insmod dhd.ko


//EDIT: dumb question, i skipped the reference website in the actual thread since it's all Chinese. That actually has my answer.

I am trying to enable both wifi and 4g at the same time by following this tutorial here:

The problem is that I cannot run:

insmod /lib/modules/dhd.ko

It always says:
init_module '/lib/modules/dhd.ko' failed (No such device)

however, if I enable wifi from the UI and try to run the same command.
init_module '/lib/modules/dhd.ko' failed (File exists)

I am using stock kernel for 4.1.2
kernel version: 3.0.31-1153417

Anyone have any idea ?