Bizhub 5020i I'm disabling WIFI but it keeps coming back

[SAR]

I have a 5020i that I have disabled the WIFI on a couple of times, but within a week it is back again.
Luckily, I only have one of these models so far, so I'm sure I'm just doing something wrong.
Here is the procedure I'm using to disable it:
settings, network, WLAN, WLAN enable-off.
If anyone can tell me a more permanent way to disable the WIFI, It would be much appreciated.

[Toxic]

I think there is small wifi icon on screen and if somebody accidentaly touch it that enables wifi and disable LAN.
I have seen it on 4020i, not sure is 5020i same design.
Stupid design to make shortcut for wifi on screen.

[elmaligno]

there is a special firmware to DEFINITIVELY disable the wifi in those equipments.

[elmaligno]

DLKM_BT2119276EN

[tsbservice]

there is a special firmware to DEFINITIVELY disable the wifi in those equipments.

Good to know although I deal mostly with Brothers in this segment. Thanks.