After much delay, and well after the carrier release of the Windows Mobile 6.5 upgrade for the HTC Touch Diamond 2, HTC has finally made the release for its unlocked devices official.
The upgrade is available for Germany, Denmark, UK, Sweden, Norway and Portugal and upgrades the ROM’s to these versions.
ROM version: Germany 2.16.407.1
Denmark 2.16.403.1
United Kingdom 2.16.405.4
Sweden 2.16.413.1
Norway 2.16.409.1
Portugal 2.16.410.1
Get the download and upgrade instructions here.