
Hardware + serial number will always work, but getting DeDRM to actually decrypt the NEW DRM is impossible. This is because Amazon changed how their DRM works.

So, most of the guides, I'm sure still work if you have a hardware Kindle and your serial number.except I'm not in that group, and the guides don't work if you are trying to follow the 'Kindle for PC' guide.

Therefore I begin my investigation into how to strip the DRM so I can convert my library. I read this content on the PC, or through the Kindle app on my phone, but decided I would drop a little money on something better suited.except I bought a device, a Kobo to be exact, that doesn't support this DRM. I suspect my foray into ereaders is very late, yet I have a ton of digital ebook content from many stores.
