Anyone else having issues with games crashing after updating to the latest GCW Zero Firmware?
Do you use the FluidSynth for the audio emulation?
In this case, probably, you need to re-instate the FluidSynth soundfont: go to the option menu, select the MIDI sub-menu, select SoundFont option, browse in the path "/mnt/ScummVM/" and choose GeneralUser.sf2 !
PS: otherwise you can utilize the Adlib sound emulation (a worse sound quality than FluidSynth, but also a lower CPU usage).