The eBook Reader reports Amazon releasing firmware 5.19.3.0.1 for recent Kindles after yanking a problematic update - bug-fix energy for anyone who hit crashes or battery drain on the bad build.
If you disabled auto-update during the mess, this is the "safe to turn updates back on" note. E-reader firmware rarely makes headlines, but bad OTA weeks are when you remember these devices are tiny Linux boxes with a single vendor in control.
(Shortened and summarised to avoid devaluing the source)