Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 815)

Resetting Camera
The camera's settings for shooting functions and menu functions can be restored to their
defaults.
1.
Select [ : Reset camera].
2.
Select an item.
Reset individual settings
Settings for individual selected items can be reset.
Factory reset
Resets all settings to defaults.
3.
Clear the settings.
Select [ OK ] on the confirmation screen.
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