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Thank you for answer.
My description was not enough.
The keyboard is the pc keyboard.
I have rebooted the Kindle. I tried to enter the u-boot menu by pressing the pc keyboard key.
But the keystroke did not work.
The serial port connection was made by soldering.
The voltage of the wire connected to the serial port is normal.
What is the problem?
Is it a battery problem that Kindle does not boot ...
But the charge is enough. The battery voltage is 4.17V.
Is the battery broken ...?
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