Hi Fogalscan,
The BCD325P2_AU is the first gen 325P2 released into Oz. Then later the UBCD325P2_AU gen2 was released which is supported by Uniden AU for updates. Both the BCD325P2_AU and UBCD325P2_AU have full frequency range without gaps but unfortunately you are stuck for updates as the gen1 scanner is not supported by US or AU firmware's.
BCD325P2_AU = Gen1 not supported by Uniden AU or US for firmware updates.
UBCD325P2_AU = Gen2 supported by Uniden AU for firmware updates.
BCD325P2 = Supported by Uniden US for firmware updates.
Cheers,
VK5DT