If synchronization is activated, you can find your BSync file in Chrome's bookmarks manager > Other Bookmarks > BSync > AllMangasReader.XXXXXXX
Paste the content of your BSync file here and click convert. If errors are detected, remove your BSync file, deactivate synchronization in AMR and import the repaired content below. If no errors are detected and if you encounter issues with synchronization, import the content below after having deactivate synchronization and removed your BSync folder.
It may help you to solve BSync issues