I tried loading this on the RetroFreak (with current firmware) and am just getting a gray screen when i boot it up.
It appears others are having issues with certain emulators as well. Will have to try a different emu to see if I can get it running.
I haven't tested it on RetroFreak in particular, but looking through their firmware updates, I'm not sure their NES emulator has received significant updates since 2016 (I could be wrong); it's very possible it doesn't support mapper 30. The majority of modern NES emulators should give you no issues running Zed and Zee unless they're based on old code.