If you had got your Armada M300 unit without any PhotoSmart R847 driver CD or the latter is lost, you may choose to follow the links below. Without a special Armada M300 driver to your unit, you won’t be able to use all its Hewlett-Packard functionality. The basic PhotoSmart R847 driver from Windows is only able to support the minimum Photosmart C8183 set thereof. You are really in need of a fully-featured authentic PhotoSmart R847 driver.
For Armada M300 download, please just follow the Stylus R200 link.