Quote:
Originally Posted by abdel.badou
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AFAIK, popup footnotes are a firmware-specific feature and were first introduced with the Paperwhite 1.
Also your Kindle doesn't appear to have the
latest firmware.
Just to be on the safe side, install the 4.1.3 firmware, compile your test file with Kindle Previewer/KindleGen and transfer it to your Kindle with via USB.
If your Kindle still doesn't display popup footnotes, the firmware of your device doesn't support it.
In that case, you'll have to buy a used PW1 (or better) or install an Android/iOS app. For example
Gitden Reader supports popup footnotes.