When I first got my foster mom (Lo) and her babies, Lo was terrified of people. She would not come out of her cage if anyone was in the room. I had to be in the kitchen out of her sight range for her to tentativly come out.
Now she's much better, and gives lots of bunny kisses.
And then Wildfire was very aggressive when I got her. She would charge and attack my hand when ever it got close to her. Every time she did it, I would just place my hand over her head/shoulders and firmly hold her down, to show dominance. After about two weeks, I was able to see a big change in her. She would still grunt (she still does), but she would no longer charge with the intent to harm. She now charges and stops right before my hand, and puts her head down. It scares a lot of people who aren't used to bunnies, but she now just gets excited to see people.
It takes alot of persistance, and showing no fear. But if the bun manages to turn around, it's very rewarding. Wildfire was not a cuddle bun or very friendly when I first got her, and now she's a huge suck, and loves people and cuddles.
Good luck, I hope this little guy turns, and at least doesn't bite anymore.
--Dawn