Canon EOS 250D Advanced User's Manual page 132

If the exposure obtained in step 1 differs greatly from the standard exposure,
z
a correct white balance may not be obtained.
In step 3, the following images cannot be selected: Images captured with the
z
Picture Style set to [Monochrome] (= 121), images shot with a Creative
filter, images processed with a Creative filter after shooting, cropped images,
and images shot with another camera.
4
Select [O (Custom)].
Under the [z] tab, select [White
z
balance], then press <0>.
Select [O (Custom)], then press
z
<0>.
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