Kindle E-Reader Software Updates - Amazon Customer Service
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Software updates automatically download and install on your Kindle when connected wirelessly. These free software updates include general improvements and performance enhancements.

There’s a new firmware for Kindles from 7th gen Paperwhite to the newest Kindle basic. Newest firmware for Scribe is 5.16.2 (May 2023).

Release notes are very short and very generic:

Version 5.16.2.1 – June 2023

Here’s what’s new:

Performance improvements, bug fixes, and other general enhancements.

Not listed in release notes, but there is now a button for annotations, that I don’t think were there before.

Have you noticed any other changes or improvements?