Just a note: if you consider buying a new ereader in the future, a Kobo can easily be downgraded to an earlier firmware version, should you happen to dislike an update. There is also a patch that makes the device ask for your consent before updating. A Kobo doesn't need to be jailbroken, it can be patched and tinkered with as it is.
Personally I find Kobos much better devices for sideloading than Kindles (I used Kindles for years before switching to Kobos). Not to mention their superb integration with Calibre.
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