This appears to be hacked firmware guys. So, try it at your own risk. Keep in mind that it would probably void your warranty, and there is no guarantee that you could find a way to convert the RAW files into a usable format.
I would also make sure to have a copy of older firmware handy for restoring (provided your camera still functions after updating).
OK. I have firmware v.1.02. Thnx Minolta.
I justinstalledthis"special"version. No troubles (first look).
Now Z2 has"Eco + RAW"instead of "Econ." if setting Image Quality in MENU. This is only change visible.
Every shotmakes pare of files - small .jpg for "preview" and approx. 5MB RAW file with jpg extension.
Now I'm looking for convertor. Author recommends own raw2nef convertor http://e2500.narod.ru/raw2nef.htm