HTC has released the Windows Mobile 6.5 ROM upgrade for the HTC Touch Diamond2. It is currently available for Denmark, Germany, Norway, Portugal, Sweden, and the UK. A valid IMEI number will be required for the free download.
HTC has already released Windows Mobile 6.5 ROM upgrades for the HTC Touch Pro2 and the HTC Snap.
Note: The update will replace the current ROM image and will erase partnership, all user data, and programs on your device. Be sure to back everything up before you start.