Before you Begin:
If you get stuck at the white HTC Logo when booting or you get "Process com.htc.dialer isn't responding" at any point in this guide, or even before it, you are likely missing your Radio. (I don't know exactly how this happens, but it apparently does sometimes.) I had this problem once, and flashing the latest radio from here in recovery fixed it.
- Flash this ROM. (Other ROMs may work, but this one gave me no trouble at all)
- Flash this Kernel. <-- Important! Firewater will fail if you don't do this!
- Follow the Firewater Instructions to obtain S-OFF. It should work the very first time. (Use the "normal, rooted device method" set of instructions.)
You should now be S-OFF! After this, you can proceed to flash your favorite ROMs Kernels, and HBOOTs. If you would like to downgrade to HBOOT 1.44 (I did), you can find the files here.
Please post if this works for you or if you need help. Thanks to all the developers who made this possible! :)