i’m on Mac OS 10.8.5
i have to you a hub (d-link powered usb hub) because i also use a monome and an op-1. this also happens if the twister is directly connected to usb port on mac…
It’s important for Midifighters to be connected directly to the computer while you’re trying to perform the firmware update. If you have had used USB hubs by accident, than the firmware might break sometimes.
Please follow this link and download the recovery.hex file from the bottom of the page and go trough all steps of the process as it is explained in the document.