Well, I dyed my hair a black with a bluish tint.
But the blues faded and it's just black.
I want it back to my natural brown colour.
Some people have said using deep conditioners and leaving it over night, Others have said using storing shampoos like anti-dandruff or normal soap.
What's the most quick and easiest way to do it?
It's my birthday soon and I really want it back for the pictures..

The best way is to go see a hair stylist in your area, and ask to get your hair lightened. Describe the color you want and ask if she/he has pallets for you to look at. Pick what is closest to your natural color and go with that. It should take no more then a couple hours. Take care of your hair properly and you'll be in good condition. Hope I helped. :)