another more hardcore approach is to unplug the leds. remove the back cover, sdcard, and battery. then use a t5 or t6 torx screwdriver to remove the four screws. remove the back casing, starting at the top, near the headphones. peel off the copper plate held on by 4 pieces of tape, but dont bend the copper. then in the middle of the circut board there will we a yellow film. peel it back to reveal a hole in the board where a long and skinny brown wire plugs in. unplug it, it just lifts straight off. follow these steps in reverse, and the softlights will be disabled.
WARNING: this WILL irrevocably void your warranty, although seeing how old the model is, i doubt it has one