First connect Cronus Zen to a Windows PC (or Mac with Windows 10 installed) using a mini-USB cable from the PROG USB Port (See highlighted in red below). Then open Zen Studio.
Open the Zen Operational Mode interface by selecting Tools 👉 Zen Operational Mode. Then select 'Normal Mode' and click Finish.
The active Operational Mode is displayed in the status bar. You can also click this area to load the Zen Operational Mode interface.