1. Download Crum Hum firmware, Teensy Loader application and TyUpdater 2. Connect Crum Hum to your computer 3. Launch Teensy loader and TyUpdater 4. Drag and drop Crum Hum firmware onto Teensy Loader 5. In TyUpdater: press reset 6. In Teensy Loader: Operation -> press program, then operation -> press reboot 7. Your Crum Hum should now be updated!