I was hoping that Koreader would be a solution but after hacking my Kindle I found that Koreader would keep randomly locking up and require me to hard reboot the Kindle (wasting several minutes, and it would lose my place in the book). I ended up buying a used Nook for around $15, the online service is discontinued but you can still sideload books (including epubs).
Re:Amazon’s new Kindle Paperwhite
by stonecharioteer on Tuesday September 21, 2021 @10:19PM
(#28612472)
Interesting. I want to try this on my old Kindle Touch.
I wonder if all the mentioned issues can be fixed by using koreader.
https://github.com/koreader/koreader/releases