Via Emu Kidd
Application from a while back which I never released:
Run GC backups via USBGecko.
Insert USBGecko into slot B and connect it to PC.
Load USB-BOOT.dol via your favourite method.
Have a GC game in the drive.
Hit A when prompted.
When the screen asks, on the PC drag a ISO/GCM into USB-BOOT.exe
Speed is terrible but compatability is pretty good once it works
Enjoy.I can’t offer support on this as I coded it quite some time ago 😛