This is a (poorly) adapted version of the Chromium bug CVE-2020-16040 for the Kindle Browser. Hopefully it can serve as a more convenient jailbreak for these models that doesn't require registration.
Guide:
Quote:
1. Ensure your Kindle is filled and there is no space to automatically update. The jailbreak process involves connecting to the Internet.
2. Extract kindle_files.zip and copy the three files inside to the root of the Kindle
3. Visit https://kindlemodding.org/nosb using the Kindle browser and follow the instructions
4. Follow the usual steps to install the hotfix - https://kindlemodding.org/jailbreaki...eak/index.html
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Before 5.19.2, Amazon used incorrect command line flags in an attempt to disable Just-in-time (JIT) compilation and make the ancient version of Chromium more secure. The PW5/KT5 both run without the Chromium sandbox enabled, meaning no sandbox escape is needed to jailbreak the device. This will not work without a sandbox escape on most other Kindles.
Credits:
Rajvardhan Agarwal (r4j) - Original CVE-2020-16040 POC
HackerDude - jb.sh script