Symmetra RM: how to cancel graceful shutdown?

[Anonymous user]

Accidentially a graceful shutdown was initiated in UPS's menu, now it spams the notification email every 2 minutes with message "Critical - UPS: A graceful shutdown process is being used to shut down the load equipment before the UPS turns off. Initiated from Serial Port 0."

Is it possible to cancel the shutdown without turning off & on the UPS? It powers some critical hardware, so it's not possible to power cycle it right now.