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unbrick a Kindle Keyboard w frozen screen, works as USB storage

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I've done everything I found on the web except attaching to the serial console to try to unbrick a 2011 Kindle Keyboard (wifi) which stopped working.
The system seems to run ok, but the screen is fixed on a book's page and has been on that page for years now. I disconnected the battery, done the reset thing on the circuit board, done all the resets available with the power button, etc.
Symptoms are: Computer can connect, save files, etc. Calibre recognizes it, can also modify it's contents. When charged the green light comes up. Disconnect it from charger and it goes off. Slide the power on and it goes green then turns off. No change on the screen, same book same page. Connect it back to the computer and I see all the contentc.

I even saved one of the jailbreak files on it and it seems to have worked as now I have a "linkjail" folder.

Is there anything else I can try? Is it possible that the screen is just broken even tough it looks fine?

Any advise appreciated.

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