I have a Nikon camera, and there is a photo in it that cannot be deleted. It seems to be locked. What should I do, find a way? .

Some cameras have this function: protect photos and don't delete them! (Of course, this protection is set by yourself. )

If you want to delete, just unlock the protection of these photos. As for what to unlock, it depends on your own camera. After all, the settings of each camera are different. Anyway, it is nothing more than setting in "Settings or Tools".

Another way is to format the memory card and it will be OK;