I bought a flashed HTC Evo 3d to Boost Mobile phone several months ago. It's working really well, considering it's a flashed phone, but I was considering selling it to another Boost user. But what must be done on my part to make sure this phone will work for someone else's Boost account? The other person has never used a flashed phone before, and I'm not that skilled in it. Can anyone help me with this, please? Thanks!