You have u-boot access working.
You have not posted anything that would have disturbed the diags system.
Use u-boot to boot the diags system.
Connect the USB cord.
Use the diags system to export the USB storage.
Copy the Amazon main system update that you downloaded to the top level of USB storage.
Disconnect the USB cord.
(the system will auto-unexport the USB storage)
Use the diags menu to exit and reboot the Kindle.
During the reboot, the Kindle will discover the update file and install it.
Your Kindle should be back to normal operation.
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