Menu > Settings > System Updates > HTC Software Updates > Check Now > OK >Yes
For those who are not that impatient, the update is confirmed to automatically roll out starting June 6th. Transitioning to Android 2.3 is done in two simple steps as the update is carried on over the air. The instructions below are given on Sprint’s website:
1. Users will receive a notification that Android 2.3 is available for download.
2. Once the user has downloaded the update, they will be prompted to install the update. The user will be notified that their device will be disabled during the installation process. The phone will be ready to use once the process completes.
So while rumors were split about a June 3rd and June 6th date for the update, it turned out that both are true. It’s not yet clear whether the update will bring the latest 2.3.4 flavor of Gingerbread, but – apart from the minor changes in the UI - it’s expected to fix some bugs including battery discharges, the ability to sync multiple Gmail accounts and display email attachments. Feel free to let us know how your update went and whether you personally find the promised improvements!
source: Sprint via Electronista