I suspect now that people know what you want to do is flash the phone to Boost, they can't help you. FWIW: more than likely, you are going to have to play games with the ESN, and that IS against the law - but that is only a part of what you're going to have to do to the phone.
So why bother?
If Boost allows Android phones (Samsung Galaxy Prevail?), then why not just put yours up for sale, and get one specifically branded for Boost? You're likely to be much more successful going that route.