I had the distinct impression that DGB only worked with Nano S and Blue devices and not their older wallets.  

"The Ledger Nano and the Ledger HW.1 don't support Digibyte."

https://ledger.zendesk.com/hc/en-us/articles/115003917093-How-to-install-and-use-Digibyte-with-Ledger

PS. Nice to see helpful community members here @ jackbox, well done!