[Dave_the_rave]

Originally Posted by Doitsu

Most likely the language metadata of the .azw file is incorrect or missing. Check and change the metadata either with Calibre or Java Mobi Metadata Editor.

Thanks for the Java Mobi app, I read your message after fixing the issue myself hehe but anyway here it is what
I have done and now I have both old highlight, notes and dictionary working good:
- Import original file to Calibre
- Edit metadata
- Chose English as language
- Chose Send to Device **from** Calibre this will send the modified .AZW file to Kindle with its language changed.
- Done

P.S. I had to chose "Send to Device" because in the conversation option there was no .AZW file type option