ZMU-4 Software Update Archive

This is the initial software release of the Software Package SUP 1.0.1 for the ARRI Zoom Main Unit ZMU‑4. 

The ZMU‑4 is a modern version of the classic and ubiquitous zoom demand. Rugged, weather-resistant, and ergonomically designed, the ZMU‑4 seamlessly transitions between wired and wireless configurations. Its unprecedented connectivity enables versatile, clutter-free camera builds and faster on-set workflows. 

With the launch of the Hi‑5 hand unit, ARRI introduced the fifth generation of its Electronic Control System (ECS). Now, the ZMU‑4 joins that new ecosystem, sharing the Hi‑5’s swappable RF-EMIP, RF-2400, and upcoming RF-900 radio modules, with different frequencies for different territories and shooting situations. Whichever radio module is chosen, it fits neatly into a recessed slot in the ZMU‑4 and becomes integral to the slimline form factor. Wireless operation is more streamlined than with any other system; there are no external radio boxes and no additional cables or setting up - just unplug from the camera and go. 

In its most basic configuration, the ZMU‑4 can control cforce motors via the LBUS connector without any wireless capability. The CAM connector opens the door to run/stop, camera control, and user button activation for ARRI and third-party cameras. Slot a radio module into the ZMU‑4 and it becomes a powerful tool for transmitting and receiving radio signals from multiple ECS devices. DPs and camera operators can jump from a dolly or tripod to a remote monitor station and still use the same muscle memory on the same tools. 

Several devices require an update to be compatible with the ZMU‑4. We recommend updating the following products to the latest firmware versions and at least to the firmware stated below: 


Minimum Firmware Version 









Master Grip




cforce mini RF


Please take your time to go through the release notes and the operating manual before using the ZMU‑4. For more information, please visit: