Just last week I was able to connect my Ronin to my Mac via the USB, but now I cannot.  I have replaced the wires and verified the USB port on the MAC.

Is there are way to "reboot" or "reload" software to make the USB to work?

The DJI assistant does work via blue tooth.

For clarification, did you notice issue after a firmware update or after a week of storage? What kind lof LED indicators are you getting from the Ronin? Regarding the Assistant app, did you happen to change mobile devices?