Amazon Kindle Paperwhite firmware 5.3.4 released - The Gadgeteer
How To Manually Update Your Kindle If You Miss the Deadline - The Digital Reader
Just performed a jailbreak on my Kindle Basic 8th Gen (KT3) running firmware 5.13.6. I had to perform a serial jailbreak took 7 hours but was definitely worth it. KOReader is 100
How to see your serial number, firmware version, and storage on Kindle
Amazon Kindle Tablets Receive New Firmware - Get Version 5.7.4
Jailbreak released for Kindle running firmware version 5.14.2 or earlier - Liliputing
How to Jailbreak Kindle Paperwhite 4 (the 2018 release) - eReader Palace
How to Manually Update Firmware on Amazon Kindle E-Reader