Disable Wireless on a Cisco EPC3925?

Question

I can't seem to turn off the Wireless Network on a Cisco EPC3925 modem/router. I can set Wireless to disabled in the "Wireless" tab of the web interface, but the wireless network remains.
There's also an option to disable it from the Setup/Quick Setup tab, but if I click the disable button there and then "Save settings", nothing seems to have changed and the form has reset itself to the initial values.

Solution

It turned out only the internet service provider (Ziggo) was able to turn off the wireless for me remotely.
I guess they put custom firmware on their modem routers to prevent customers from being… difficult? I imagine they have more problems with people complaining about a lack of wifi, than people wanting it gone.

Comments

[Protector one]

I already put the Wireless Configuration to Manual—makes no difference. And like I said, disabling it in the Wireless tab doesn't actually disable it.