In order to do a manual update of your Kindle Fire HD or HDX to the brand-new Fire OS 3.1 software, you need to use the Android File Transfer utility which enables sideloading of your Fire from a Macintosh computer. The Windows instructions talk about an “internal storage” folder where you drag the 3.1 update file onto your HDX using a PC. But that folder doesn’t appear in the view of your HDX via Android File Transfer on a Mac.
The solution, which I arrived at with help from several Mayday sessions, is to drag the update file from your Mac onto the root level of the HDX, so it’s at the same level as all the folders that you see using Android File Transfer. The update file is a big one, so it will take a while to transfer, and don’t disconnect the USB cable until it’s finished.
Then pull down the Quick Settings on the HDX, tap on Device and then System Updates. Tap on the Update button, and your HDX will update to 3.1, which is a major upgrade including the Goodreads integration.
If you have any questions, please feel free to email me at Podchronicles AT gmail Dot com.