Good news. A group in China is making a replacement OS for the Kindle. Bad news. They seem to have their own interests at heart, not ours.
They seem to really like PDFs, and even non-DRM’ed EPUBs, because if you only had books in that format, this is what OS you’d write yourself. And if you lived in a country that frowned on citizens browsing the Internet, you’d disable it. Which is what we have here. I’m only telling you because, maybe there’s people out there that are like, “That’s what I want!” So here is the link, Right Here. I loaded it to see what it is about, I’m sure you can too if interested. Easy to uninstall, too!