I assume you are talking about the DeDRM tools? If so, the answer to your question is that it doesn’t work as well as it used to. The era of easily strippable DRM is ending.
Amazon’s latest file format KFX hasn’t been entirely cracked and it’s possible it won’t ever be entirely cracked. The best anybody can do so far is to buy an older Kindle and download it to that in order to get a crackable version. The problem with that is you lose all of the typography improvements only available in KFX.
