Seeed SenseCAP RS485 pH Sensor - How to exit Active Output mode?

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I have this sensor with me. I am currently using this sensor in Active Output Mode (which streams sensor data automatically at fixed intervals). However, I need to change the settings, and the sensor is not accepting any commands now.

The user manual says “Use key button to restore the serial comm parameters factory value to exit the active output mode.”, But my sensor does not have any physical button anywhere.

Can someone tell me how do I exit the Active Output mode, so that I can configure it again.