I've transferred files to Marvin via USB using iTunes File Sharing and that works perfectly fine. I'm not familiar with iExplorer so no idea if that will work the same way.
To be safe, I recommend creating a backup within Marvin first (General settings - backup and restore - Backup now) and save the backup to a safe location. This backs up your books and Marvin's database. Then you can try if copying via iExplorer works.
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