ALL RIGHT!!
TK sent me the Beta for MIOS Studio MKII and uploading seemed to work....
I say seemed because after uploading setup_sammich_sid.hex, I got the message "Rebooting MIOS" on the LCD of the Sammich.
Unfortunately nothing happened after that. I tried turning it off and on after shutting down MIOS MKII and re-starting, as well as trying to start up 9.4 (which crashed as soon as I connected the ports and started the Sammich) to no avail.
Now, when I turn on the Sammich, I just get blocks instead of "Ready".
These Midiboxes hate me.