Remove the cover for the battery compartment. The compartment is
located on the back of the DS Lite unit and the cover has a small screw
holding it in place. You will need a Phillips size 0 screwdriver to
remove it.
Take out the DS Lite's battery pack. There is a tab at the top of the
battery pack. Insert your fingernail or the end of the screwdriver
carefully into the edge of this tab and pop out the pack.
Keep the battery pack out of the unit for at least 10 seconds. If you
keep the battery pack out for too short of a time, it will not cause a
reset in the unit.
Put the battery pack back into the unit. Just line it up in the compartment and push it back into place.
Turn on the DS Lite. If the unit has properly reset, a screen will come
up that reads "Before you begin, you must adjust system settings." You
can now enter all new settings and information on your DS Lite. If you
do not get the system settings screen, you did not keep the battery
pack out long enough. Repeat the steps and leave your battery pack out
for a longer period of time.
http://vodpod.com/watch/2607802-nintendo-ds-lite-reset
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