i need to lighten black to brown

I dyed my hair to black and i absoloutly hate it. I want to dye it brown again, but it wont work. Ive heard leaving dandrif shampoo in overnight helps get colour out. And iv heard that vinger and then in the sun helps.. Do these methods work? What else should i do!! pleeeaseeee help me!!!

Use a color stripper. ColorFix is very good. I've used it in the past. It removed black dye successfully every time. It will only lighten your hair to either reddish or reddish brown color, possibly orange, depending how stubborn the dye is. Then re-dye with brown color of your choice. Not very damaging at all.