I think the boots are making it worse. It can't stay off its back with them on. I'm going to give him another day, but I don't think it's going to make it.
Edit: I tried putting it in the brooder with the other chicks, but they immediately began to peck at its feet. I don't want to cull another!
Im sorry dear, hatching is tough, and we strive to do our best but it is what it is. Id still give him more time before making a final decision anyway.