I think the DC charge rate is dependent upon the battery used. If all models of MX-30 use the same battery then a DC charge rate upgrade should be possible via software update… If the newer models use a newer battery type, then I think the older models are stuck at their current charge rate ☹I don't believe so. Mazda, to date, have not offered any such upgrade but to be honest I don't really know if it is a simple bms s/w update or h/w is involved in the control process.