Once you have the Umikaze image for the BeagleBone Black downloaded to your computer, you can transfer it to a microSD card.
Note
The latest version of Umikaze requires at least 4GB
Several programs are available to burn the image on the microSD card. Etcher is recommended.
For Linux, make sure you make the app executable and start it as root:
cd ~/Downloads
chmod +x Etcher-linux-x64.AppImage
sudo ./Etcher-linux-x64.AppImage
Run the program installer and launch the application.
Open the DMG to drag the app into the application folder. Launch the application.