There are more regions including South America, Australia/New Zealand, China etc. The first two letters ( MD) represent EMEA region, AA would be USA/North America. This model number is for a EMEA UHF DP4400 (non-E) version. If you look on the back of any Motorola Solutions radio, you will find a number that looks something like this ' MDH56RDC9JA1AN'.
MOTOTRBO radios and software are region specific. In which case, even with a DP4400 code plug, you would still not be able to modify a DP4400. The only way this is possible is that you have the non-EMEA version of MOTOTRBO. I have two different CPS, but in this two I haven't a DP4400 codeplug.
