The installations:
a. The distance between two hubs is at least 1.5 meters when multiple Solidcom C1 hub-based systems are cascaded.
The firmware requirements: Solidcom C1 HUB-based system versions later 1.0.4.2 , Solidcom C1 no-HUB system versions later 1.0.4.5.
Firmware upgrade manual:https://drive.google.com/file/d/1qNu9N_hwmJEgH2Q-LgGM5Ua-SCuT4qX3/view?usp=sharing