The K4 and older instructions on [this page](https://kindlemodding.org/jailbreaking/post-jailbreak/installing-kual-mrpi/) don't work, I have tried it with two kindles. [This reddit thread](https://www.reddit.com/r/kindle/comments/1ipko3u/comment/mcw6m8t) worked instead.
The K4 and older instructions on this page don't work, I have tried it with two kindles. This reddit thread worked instead.