Similar to Apple, Kindle's software has always been proprietary... [I]f you buy a Kindle today, you have very little hope of actually being able to customize it without resorting to "breaking in" through hardware modification. Read more: https://u.fsf.org/3zi
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@fsf i was lucky to buy a used kindle one when the amazon book store and whispersync still worked and since it had a sdcard it was relatively easy to copy them simply on a computer, and since kindle 1 used the original book format this could still be ripped to open source ebook formats using online tools
