Start MIKI-D Control to update the Firmware. Make sure the MIKI-D is not active or in use by any application, then navigate to the tab menu “Tools/Update Firmware”.
Shortcuts:
Windows: Ctrl+U
macOS: CMD+U

The latest firmware file can be chosen via the navigation button.

Click the Update Firmware button.

The MIKI-D will switch into a serial communication device, to receive the Firmware.  ( First time you will be prompted to install the MIKI-D serial Communication driver for Windows. The driver file is located in the installer directory of the MIKI-D Control application. NOTE: In macOS and Windows 10 this is not needed, but in macOS you will see the device listed twice; once as CU and secondly as tty. Please select CU )

Now the Firmware is send and written to the device. If for some reason you get an error message, just try again. ( if you unplug the device while the it is in serial mode, you can still update the firmware, just select the serial device )

When the programming is finished the MIKI-D switches back to the new firmware as an audio device.