running 4.1.3HF1 for Domino here ...
Had to install the handheld software on the BES to get the apploader to the latest version. then has to add the 8320 to the Device.xml file (located in the apploader directory)
The firmware install got the 8300 entrie, I had to customize myself an 8320 entry
I was always able to activate the phone (OTA) but I could not push software to the device with out the updated files.
<!-- 8300 -->
<os radio="GPRS" series="8300" Colour="True" Theme="Normal" JVMLevel="1.0" Camera="True" VoiceNotes="True" pttApp="True" Memory="Large" KeyboardType="Qwerty" Sound="Tunes8700g" SystemSize="normal" Bluetooth="True" MMS="True" ThemeSupport="Enhanced" VAD="True" JPN_Input="False">0x96000F03</os>
<!-- 8320 -->
<os radio="GPRS" series="8300" Colour="True" Theme="Normal" JVMLevel="1.0" Camera="True" VoiceNotes="True" pttApp="True" Memory="Large" KeyboardType="Qwerty" Sound="Tunes8700g" SystemSize="normal" Bluetooth="True" MMS="True" ThemeSupport="Enhanced" VAD="True" JPN_Input="False">0x84000F03</os>