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Before you proceed, please confirm that this software upgrade is a newer version than is on your device. If it is the same version and your device is operating normally, there is no reason to upgrade. Refer to the image left and note the ROM version, CPU, and Radio Version.

To check the software version on your phone, go to Start, Settings, Device Information.

Before you run the ROM Upgrade Utility (RUU), make sure you check and do the following first:

1. USB sync cable is connected to the computer.
2. The standby and hibernation modes are disabled on the computer.
3. All running applications on the computer have been closed.
4. USB sync cable is connected to the Mobile Device to establish an ActiveSync connection with the computer.
5. Do not interact with your Mobile Device unless instructed to do so.

General Procedure on Installing the ROM Update

1. Back up your personal data from the Mobile Device to your computer using ActiveSync if you want to ensure you don’t lose any of your data.
2. On your computer, run the ROM Update Utility (RUU) to install the ROM update to your Mobile Device. (The next section provides a detailed procedure on how to install the ROM Update).
3. Restore your personal data back to your Mobile Device using ActiveSync. (Optional)

• Download
• Installation Instructions
• HTC Webpage

Source : Engadget Mobile

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Chris Leckness is the Owner/Administrator of Mobilitysite. He is a Microsoft MVP, Mobile Devices and a member of the exclusive focus group, Mobius. Chris runs a Mobilitysite, GotZune, and a few other smaller sites and blogs. His personal blog is chris.leckness.com.