I have a huge Buff Brahma rooster Penrod who, at six months, decided I was a threat that needed to be controlled. Penrod, unlike most roos, didn't try to chase and flog me or spur me. He would bite me. I mean really BITE, as in removing chunks of flesh, leaving deep holes in my hand, arms or legs.
It was a huge problem. I was so desperate at one point I volunteered him for Christmas dinner at the local Christmas party. Meanwhile, I had contacted this guy:
http://olychickenguy.blogspot.com/2011_03_01_archive.html who studies chicken behavior. He worked with me for the next six months rehabilitating Penrod.
I understood finally that Penrod was biting me because he didn't trust me and was actually scared of me. There are many ways to get a roo to trust you, but it requires patience. I discovered one of the things that was making Penrod feel threatened was sudden movements when I got near him. He would react with a vicious bite.
Over time, Penrod came to trust me without reservation. I learned he was a very high strung roo who takes his job very seriously. He takes every threat personally. But now, instead of fearing me, he's in love with me. When I bring him food, he's very careful to offer the first bit to me before he eats. When he becomes upset over a possible threat, he lets me hug him until he quiets down and isn't afraid anymore.
Yes, roosters can change. It's up to you, though. He won't do it on his own. Most people find it easier to butcher a troubled roo or to just kick him around rather than discover what his personal issues are.
I have another roo, Darrel, who had the opposite problem of Penrod. He was so frightened of me he would go into total meltdown if I tried to so much as touch him. He, too, has completely changed with individual attention.
The underlying issue with all problem roosters is fear and lack of trust. If you can figure out what kind of rooster you have, you can work to gain his trust. With time, he'll come around. Yours is at the perfect age to rehab. Spend the time with him now and you'll have a great roo for life. Go visit Oly's web site and you'll begin to learn why roosters do what they do. If you e-mail him, I bet he would give you some special help with your roo like he did with my boys.