[Kevinik]

Call HTC tell them you installed an update from there (HTC.com TP2) web page and the phone now won't turned on. Act like you don't anything about phones essentially like a newbie. They will probably tell you to call later the manufacter company that takes over RMA. And that company will tell you the RMA process.

That's what I did when I bricked my TP2, they replaced the whole motherboard so the IMEI got changed.
Good Luck.