I'm thinking of getting one of Ledger Blue with firmware 2.1. On their blog post, it says 'developer needs to create a specific Ledger Blue version of the app'. Are the ZenCash team thinking of implementing app for Ledger Blue? --> https://www.ledger.fr/2018/07/02/new-ledger-blue-firmware-version-2-1/
If I am correct you can't use the Ledger Blue with Zencash. But you can with the Ledger Nano S and the specific app for zencash
Ledger they would handle the Blue firmware, but need confirmation. Stay tuned.