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

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All built-in wireless communication settings can be deleted. By deleting 
the wireless communication settings, you can prevent the information of 
the settings from being exposed when you lend or give your camera to 
other people.
1
Select [Communication settings].
Under the [54] tab, select 
[Communication settings], then 
press <0>.
2
Select [Built-in wireless settings].
3
Select [Clear settings].
Set [Wi-Fi/NFC] to [Enable], then 
select [Clear settings] and press 
<0>.
4
Select [OK].
[Built-in wireless settings] are 
cleared and the menu screen will 
reappear.
Clearing Built-in Wireless Communication Settings
Performing [55: Clear all camera settings] does not clear settings for 
[Built-in wireless settings] (except [Wi-Fi/NFC] settings).