I come here every now and then to see if there's any news on the matter. Please don't delete/move this topic, it is very useful and (considering that it is the successor to the previous one) it has existed for 7 years, if there have been no problems for 7 years I really don't see why raise the issue now.
If you really need to move it please send me a mp so that the next time I connect to the forum I know where is the topic I need.
PS. I got a news, manga are again in KFX format. Like in the previous version the drm removal works but to convert them you need to use calibre-debug cli (it is not possible to convert the kfx with the calibre interface)
Example on how to do it:
calibre-debug -r "KFX Input" -- -e "pathtokfxfile.kfx" "pathwhereyouwanttosaveyourepubfile.epub"
if you want the kindle format without drm just send the epub to kindle
https://www.amazon.it/sendtokindle
or use Kindle Previewer 3