You can also use the KUBRICK software to reflash the Kindle Keyboard to version 3.4. I used the route where I downloaded it and burned it to a bootable DVD so it even runs on my Mac when I choose the DVD as the startup disk. It is pretty straightforward in operation, but as the page says, it does take 2 to 3 hours to do a Kindle Keyboard.
See the following post.
https://www.mobileread.com/forums/sho...d.php?t=206064