I don’t know about the Nomad but some of the later ZEN player had newer firmwares that borked the battery replacements. The Vision W doesn’t seem to care I think partially because the BMS board is built into the battery itself. I bought some extra storage adapter boards to test so may grab a ZEN touch or vision M to play with but I need to get my library cleaned up first.

On the transfer side, some of the later models or later firwares basically turn them into mass storage drives. My player shows up in Linux with no drivers fwiw.