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The GitHub repo for the DRM removal tools is here:
https://github.com/apprenticeharper/DeDRM_tools
The README says this:
> Note that DRM can only be removed from KFX format files downloaded with Kindle for PC/Mac 1.26 or earlier. Amazon changes the DRM for KFX files in Kindle for PC/Mac 1.27 and later.
KFX is different from older versions in that the file is tailored to the device it is downloaded on. If you download with the Kindle for PC, the file is optimized for your big, high resolution screen and isn't going to be great on an eink device.
There are no cracks that work with the KFX files extracted from the Kindle reader.
Calibre is great, but IMO it’s the wrong approach for this particular conversion. Use KindleUnpack instead, which is close to lossless.
https://github.com/kevinhendricks/KindleUnpack
Shameless plug and this is only loosely related: Over the last holiday season I wrote a backend (written in Go and running on App Engine) to convert http url into epub. The frontend is a telegram bot that sends the epub to your reMarkable account directly, but it also has rest api to download the epub file: https://github.com/fishy/url2epub/blob/main/REST.md
The Docker Package on Synology made this very easy when I was new to Docker some years ago, and it hasn’t been touched since the initial install, it just works.
https://github.com/linuxserver/docker-calibre