Amazon Kindle Troubleshooting Post-System Update Experience

This story is a continuation from my Amazon Kindle System Update Experience.

2 days ago until yesterday, I waited for the Kindle screen to turn off or go blank. But the screen remained "lit" showing this screen: "Please wait a moment while your Kindle starts up."

I then searched for YouTube videos featuring Kindle battery replacement and found these:

https://www.youtube.com/watch?v=0vqUvf6_qYQ
https://www.youtube.com/watch?v=lrcxn5mQKe4

I had hoped that the videos would guide me in removing and then putting back the battery as this would reset the screen. Or so I thought.

True enough, the videos guided me on how to remove the 2-panel back cover and remove the battery. Unfortunately, the display screen remained "lit" with the "Please wait a moment..." screen display even as the batteries were removed altogether. I initially suspected that the Kindle had a smaller backup battery similar to the BIOS battery in older PCs for holding ROM configuration data. But after several minutes of waiting, I got tired and went to review the YouTube videos. It turns out that this Kindle flashes/flushes the screen with the last display bit to conserve battery power. This means that this Kindle employs a technology where the last display is "temporarily burned in" until it is time to change it again, so that the device can sustain a fantastic battery operating performance.

Either that or I have bricked this Kindle.

With nothing else worthwhile to do from this situation, I proceeded to put back everything in place.

I then recharged the device. It turns out, the Kindle ran out of battery power only a few minutes after I updated its system software. That was lucky. As soon as battery power picked up a considerable amount of charge, the display screen resumed "springing back to a responsive life".

Piece of chocolate cake.

Related images:

Opening the back top cover
Using the flimsy plastic of my ballpen's cap to unhinge the back cover clips
Screwdriver wasn't small enough to remove the battery screws. Searched, found and borrowed a smaller toolset for this purpose.
Battery finally removed. Yay!
Battery removed, but the display screen remained lit. WTF?!
Speculation time. Reviewed YouTube videos to get a hint of what display screen technology Kindle employs. Temporary burn-in by design?
Bricked or not, nothing else left to do but put back the pieces together.
Plugged in the device and the screen changed. Yay!
Exploring the Home screen
Buttons appear to work well
Latest system version, 2.5.8 as of this writing, is shown in the Device Info
The device looks to have been brought back to normal. Yay!
Latest version verification on the website with the prevailing date shown on the cellphone