HTC Desire Update Firmware Android 2.1 Download Through WiFi

HTC Desire reported gets an update firmware Android 2.1 and ready to download.
The number of software after update should be 1.15.405.4.
The firmware update will be available OTA (Over The Air) so the user will be notified and then just press OK to run the update Firmware process.
When the update is finish, go to Menu->Setting->About Phone->Software information->Software number and the software number should be 1.15.405.4.