This is a complete guide on how to jailbreak your Kindle : Jailbreak + Installing KUAL and then how to install plugins.
https://www.ereader-palace.com/how-t...e-2016-method/
They will also show you how to turn off auto update and how to install plugins after the jailbreak , (my best plugins are Koreader vlasovsoft)
The Jailbreak still works with the last version which is 5.8.9.2 (on kindle voyage)
It is very useful and easy to understand