AZW3 Won’t Open on Colorsoft – Need Help

Hi everyone,

I’m trying to load AZW3 eBooks (converted from EPUB, not from Amazon) onto my Colorsoft, but I keep getting error messages. Sometimes I can read a few pages, but most of the time they won’t open at all.

I’ve tried:

- Using Calibre via USB
- Send to Kindle (still fails to open)

These same AZW3 books work fine on my 2021 Paperwhite.

Has anyone found a reliable way to get non-Amazon AZW3 eBooks working on Colorsoft? Any advice would be greatly appreciated!