[mallomar]

Originally Posted by HappyCalibreUser

You should try this on some duplicate book in Calibre whose cover you won't mind changing first.

This is the way I've learned to change a cover in Calibre, others may have another way:

Select- Convert Books
Select- Look & Feel
Select- Embed all fonts in document

For me, the new cover is added and nothing in the books changes.

I tend to tinker with settings all the time so I may have made changes to Calibre I don't remember. But this is what I do.

Thanks. I can get a new cover to stick in Calibre by converting or polishing, the problem is getting that cover on my Boox without overwriting my existing file, with notes and highlights. Or do you mean this works for you for sideloading?