I know there are some snakes that will only eat live but I do believe the majority of them can be converted to f/t. It takes a lot of patience sometimes but if the snake isn't losing a lot of weight you just have to wait them out. Eventually they'll get hungry and eat what's available. Once they take f/t I would never offer live prey again unless absolutely necessary. You have a very nice BP. I'm sure you don't want him to get injured, or worse, by his food.