I'm in the same situation at the moment, I think someone has been able to upgrade the z110bt to a UK spec f20bt but I don't think Pioneer has released any updates for the f20-f30bt (which I assume would be needed to do z120bt - F30bt). Ralpharn seems to be making good progress, we might be able to just swap the maps with ones from an AU F30bt which would be ideal. We just need to get the maps to give it a go.