It's time for another round of software updates for all 10th and 11th generation Kindles, including the Kindle Paperwhite 4 and 5, along with the Kindle Oasis 3, the current and previous entry-level Kindle, and the Kindle Scribe. The new software version is 5.16.6, and it's available to download from the Kindle Software Updates page
So every single book I transferred from Calibre was deleted : r/kindle
Here is how you can downgrade your Kindle software to previous versions - Good e-Reader
Is the Kindle Oasis dead? : r/kindle
Kindle: Diverse E-Reader von erhalten Update mit neuen Funktionen und Verbesserungen - News
Kindle firmware 5.16.4 available now : r/kindle
No group series option & download issues:11th Gen Kindle : r/kindle
Send to Kindle Apps for PC and Mac Now Support EPUB
How to Manually Install New Software Updates on Kindle
Kindle firmware 5.16.4 available now : r/kindle
Releases First Software Update for the Kindle Scribe (5.16.1.2) – eWritable
Kindle firmware 5.16.4 available now : r/kindle
is updating Kindles to make them easier to navigate
Releases First Software Update for the Kindle Scribe (5.16.1.2) – eWritable
Software Updates – eWritable
Kindle FW 5.16.7 available now : r/kindle