Due to the size and complexity of the update, over the wire update is not available. You must download the appropriate files and perform the update from your computer.
Download the Software update for the HTC Hero with Google and the HTC Sync Upgrade 2.0.33 from Sprint Software Downloads
Detailed instructions on how to perform the update can be found on the Sprint Support Site.
One very important thing to remember and you will be reminded several times during the upgrade is the update wipes off all information from the phone. Back everything up first!
I performed the update on my Hero. The process takes approximately 10 minutes and I didn’t run into any issues throughout the process.