Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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On the [View info] screen, you can check the error content and the 
MAC address.
1
Select [Communication settings].
Under the [54] tab, select 
[Communication settings], then 
press <0>.
2
Select [Built-in wireless settings].
3
Select [Wi-Fi function].
Set [Wi-Fi/NFC] to [Enable], then 
select [Wi-Fi function] (p.20).
4
Press the <B> button.
The [View info] screen will appear.
When an error has occurred, press <0> to display the error 
content.
You can check the MAC address of the camera on this screen.
View Info Screen