open-source utility used for burning image files. Install and launch it.
Now, download the latest image `here <http://nightly.odoo.com/master/posbox/iotbox/>`__, and extract it from the zip file. Then, open *Etcher* and select the image.
Select the drive to flash (where your SD Card is) and click on
*Flash*!.
Now, your image will be automatically updated. You just have to wait 5 minutes for it to finish.