Try This:
(Make sure your camera is not in iAuto when going through these steps.)
Step 1 -> Menu
Step 2 -> Scroll down to the picture of a gears
Step 3 -> Use the right arrow to go into custom menu
Step 4 -> Scroll down to "Button/Dial"
Step 5 -> Use the right arrow to go into "B. Button/Dial"
Step 6 -> Find "Button Function" and press the right arrow
Step 7* -> Chose either "Fn 1" or "Fn 2" (function)
Step 8 -> Use the right arrow to go into Function Button setting
Step 9 -> Scroll through the different presets for functions until find the symbol with 3 fish & 1 fish
Step 10-> Press OK
Step 11-> Press menu button 3 times or press the shutter release button once to exit the menu
At this point the flash will fire when in down position.
Step 12 -> To get out of underwater mode, switch between different modes; example - shutter to aperture back to shutter
You do not need to leave the camera in underwater mode for the flash to continue working in the down position.
You only need to do this when you first set up your camera.
(Make sure your camera is not in iAuto when going through these steps.)
Step 1 -> Menu
Step 2 -> Scroll down to the picture of a gears
Step 3 -> Use the right arrow to go into custom menu
Step 4 -> Scroll down to "Button/Dial"
Step 5 -> Use the right arrow to go into "B. Button/Dial"
Step 6 -> Find "Button Function" and press the right arrow
Step 7* -> Chose either "Fn 1" or "Fn 2" (function)
Step 8 -> Use the right arrow to go into Function Button setting
Step 9 -> Scroll through the different presets for functions until find the symbol with 3 fish & 1 fish
Step 10-> Press OK
Step 11-> Press menu button 3 times or press the shutter release button once to exit the menu
At this point the flash will fire when in down position.
Step 12 -> To get out of underwater mode, switch between different modes; example - shutter to aperture back to shutter
You do not need to leave the camera in underwater mode for the flash to continue working in the down position.
You only need to do this when you first set up your camera.