Wirelessly posted (HTC Touch Diamond: HTC-P4600/1.2 Opera/9.50 (Windows NT 5.1; U; en))
Have you tried installing ActiveSync (XP) or Windows Mobile Device Center (Vista)? This will install the drivers needed for usb syncing.
Once that is installed, put the phone in triggered bootloader mode and skip flashing the rom in Internal Storage. Hookup the USB to the phone and computer. Your computer should attempt to install a driver called 'Microsoft USB Sync' or 'HTC USB Sync'. Once that is successful the phone will switch from 'Seiral' to 'USB'. Download your respective carrier's latest ROM and attempt to flash!
Good Luck, hope this helps!
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Phones, Past to Present: HTC Wizard, AT&T Samsung Blackjack, HTC Touch Diamond, HTC Evo 4G
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