This is a simple KUAL extension which lets you block some of Amazon's servers to prevent them from deleting part of MKK (the Kindlet DevCerts) when connected to the internet but not registered with Amazon. Notably it doesn't block the NTP servers to allow time sync.
The list of servers is based on the one I found in this repository
https://git.sr.ht/~sotirisp/kindle-hacks
I tested the block/install script on a k4b and it worked fine.
I tested the unblock/uninstall script with "sed --posix" on desktop Linux and it's a very simple one so it should work anywhere in theory, but just in case, there's a backup of the original /etc/hosts from my k4b in the package. Granted the install script appends things to /etc/hosts so it's non-destructive in the first place.
Of course you shouldn't use this if you do want to use Amazon's online services with your kindle.
To install, extract the archive into your KUAL extensions folder, then run the block option in the KUAL menu.
To uninstall, first run the unblock option and wait for the kindle to reboot, then you can remove the extension's folder.
The list below follows this format:
File | Release Date | Size | SHA1