I know this tool works on the CDMA Sprint Diamond:
http://forum.xda-developers.com/show...54&postcount=8
I did a search on this and google for such a tool and couldn't find anything that said that this worked. The tool that HTC came out with points to a version that corresponds to the GSM phone... so no way for me to know if it worked on the CDMA one.
So, if you already knew all of this... please ignore this post. For search engines and other people to catch: This particular gsensor calibration tool seems to do to the trick! (my phone didn't blow up after using it... a plus! lol.)