
Download the bootloader image file for your board from https://www.kosdev.com/latest/downloads
In macOS, the file is automatically unarchived, and the kos-installer.img file will be present in the download location.
In Windows, the user must unarchive the downloaded file and use kos-installer. img for flashing.
Download and Install Balena Etcher from https://www.balena.io/etcher/
Unzip the .zip file and have the .img file in case the .zip file is not unarchived.
Launch the Balena Etcher application.
Insert the storage device for installation into the laptop / Macbook
Click on ‘Flash from file’.
Select “kos-installer.img” which was downloaded earlier and Click “Open”
Click on the “Select Target”.
Select the checkbox against the thumb drive which will be used for flashing. Then click on the “Select” button.
Click on “Flash!” button to proceed.
Once the flashing process is started, Balena Etcher will display its progress and validate the write after completion.