A firmware update for the DJM-A9 is now available.
This update includes the following change.

• UASP-compatible USB storage devices could not be recognized.
  NOTE: Please use a non-UASP USB storage drive to apply this update. UASP-compatible USB storage devices can be used after this update.

Firmware Update Manager
You’ll be automatically notified when firmware updates become available. You can download the Firmware Update Manager here.