A paperwhite 1 gets colour images and azw3/KF8 for regular reflowable novels. All later models get KFX which takes much longer to download (throttled) because it can read while downloading. Also for most Kindles the KFX images and cover are mono (B&W).
So a gen5 / Paperwhite 1 is the last good model to download for DRM removal and reading elsewhere. Especially keep the PW1 & registration if getting a newer ereader (Kindle, Kobo, Pocketbook or Onyx Boox).
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