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All of my testing is being done with good working units. I can hit return on my computer and stop the boot process and see the U-boot prompt. So, that tells me that I have two way communications with the Kindle. I have also tried this while the USB was connected. I have one good Kindle screen and several units with broken screens so, I would prefer to use the serial connection for my experimenting and would sure like to get the 'Log-in' screen.
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