I'm going through the same thing right now. Advice I got from the breeder was to continue with live since he's very young. I did so last week, and will probably feed live again once or twice more before attempting to switch to f/t again with him. I believe that once he really settles in here and is not stressed, maybe he will be ready for me to try again. My new amazon tree boa switched for me the same day I brought him home...wish they could all be that easy. After thawing the mouse out, i put it in some pretty hot water for a min or so to really warm it up and he took it right away. Good luck with yours!