Install prerequisites
one at a time. Install them by choosing "
Update Your Kindle" from the Settings menu,
NOT "Restart". You can try a thousand times -
"Restart" will NEVER work to install these update packages.
If you copy the files via SSH, "Update Your Kindle" will remain grayed out though. See
here for a solution.
PS: You could have easily found this out yourself by searching this forum (or google) for "update error 003" or similar. It has been explained dozens of times.