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How to disable the WiFi on RPi 3B+?

It would appear that by default the emonSD-30Oct2018 sets up the RPi 3B+ WiFi as an access point. I am using Ethernet cable, so I want to disable the WiFi for security reasons.

Ref:

To completely disable the onboard WiFi from the firmware on the Pi3, add

dtoverlay=pi3-disable-wifi

in /boot/config.txt .

This is documented here. Please be sure to use an up to date firmware, this feature was added in January 2017.

There is also an overlay for disabling onboard bluetooth : pi3-disable-bt . If you want to disable both wifi and bluetooth, you need to add these 2 lines :

dtoverlay=pi3-disable-wifi
dtoverlay=pi3-disable-bt
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