I know this post is a bit old but I found this while doing some searching. I have a icom M93 D DSC radio. I'm going through the same trouble it has a MMSI number that I need to reset - were you able to get yours reset and if so how did you accomplish this? Thanks in advance.
You can have it reset, but you have to return the radio to an agent to have it done for you.
I've not been able to find any workaround to this.
Rob
Currently Epic V10 Elite, Epic V10 Double.
Previously: Swordfish S, Evo II, Carbonology Zest, Fenn Swordfish, Epic V10, Fenn Elite, Red7 Surf70 Pro, Epic V10 Sport, Genius Blu, Kayak Centre Zeplin, Fenn Mako6, Custom Kayaks ICON, Brian's Kayaks Molokai, Brian's Kayaks Wedge and several others...