Tap "U - USB Export" on the screen.

Plug your Kindle into your computer through the Kindle's USB port.

Download the Kindle firmware from https://www.amazon.com/gp/help/customer/...

Open the Kindle drive on your computer and drag the .bin file into it.

Eject your Kindle and unplug it from your computer.

Press "Q" either onscreen or in your serial terminal.

Tap "Reboot or Disable Diags", or type "D"

Tap "Reboot System", or type "R"