Nikon D3400 Kit Owner's Manual

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168 Playback and Deletion
Press the 
A (L) button to protect the current picture from 
accidental deletion. Protected files are marked with a 
P icon 
and can not be deleted using the 
O button or the Delete option 
in the playback menu. Note that protected images will be 
deleted when the memory card is formatted (
0 201). To remove 
protection from a picture so that it can be deleted, display or 
highlight it and press the 
A (L) button.
Protecting Photographs from Deletion
A (L) button
A
Removing Protection from All Images
To remove protection from all images in the folder or folders currently 
selected in the Playback folder menu (
0 187), press the A (L) and 
O buttons together for about two seconds during playback.