loreal feria hilift on previously dyed hair

Unfortunately, permanent colour won't lift permanent colour. Since you mentioned Feria Hi-Lift, I'm assuming you want to go lighter. In order to do this, you will have to use a permanent hair colour remover like ColorFix. If you can live with your current colour, you might be better off waiting for it to grow out before colouring again. ColorFix will cause some damage to your hair; it also may not remove all the colour on the first application. I think it is best left for hair colour disasters that you absolutely must get rid of.