Canon EOS 250D Advanced User's Manual page 179

Setting the External Speedlite Custom Functions
The Custom Functions displayed under [External flash C.Fn setting] vary
depending on the Speedlite model.
Clear All Settings to Default
The Speedlite's Personal Function (P.Fn) cannot be set or canceled on the
z
camera's [Flash control] screen. Set it directly on the Speedlite.
1
Display the Custom Function.
With the camera ready to shoot with
z
an external Speedlite, select [External
flash C.Fn setting], then press <0>.
2
Set the Custom Function.
Press the <Y> <Z> keys to select
z
the function number, then set the
function. The procedure is the same as
setting the camera's Custom Functions
(= 446).
1
Select [Clear settings].
Under the [z: Flash control] tab,
z
select [Clear settings], then press
<0>.
2
Select the settings to be cleared.
Select [Clear built-in flash set.], [Clear
z
external flash set.], or [Clear ext. flash
C.Fn set.], then press <0>.
When you select [OK], the respective
z
flash settings will be cleared.
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