I already sent you the Mephisto I,II,III roms =)

As for the changes unrelated to Brikett:
- dallas and amsterd romdumps were wrong (23KB and 28KB eprom chips don't exist, the files were truncated)
- romsets were renamed for consistency like the other Mephisto 32bit/16bit sets

Neither of those changes are necessary to get Brikett emulation to work. And yeah, they worked fine before too, so you won't have to copy these changes over if you don't want to.