Hi, here, I have a habit of keeping ALL the firmware in stock, for this kind of problem precisely;)

http://www.k-upload.fr/afficher-fichier-2018-12-24-130034350antminerd320.gz.html      ( Antminer-D3-201711201715-0M.tar.gz )

in view of the practice of bitmain, in my opinion, you can not reflash another firmware ... just try