Roborock C1 CE - Manual (Page 14)

Routine Maintenance
13
Machine sensor Clean monthly
Use soft dry cloth to wipe and clean each sensor, including:
1. Four cliff sensors on the bottom of the machine
2. IR decelerate sensor in front of the machine
3. Charging contact on the bottom of the machine
Charging contact
Cliff Sensor
Dock charger Clean monthly
Use soft dry cloth to clean the charging contact of the dock charger
Reset system
Firmware update
When pressing keys makes no response or the machine cannot
be shut down, please try to reset the system by pressing the
key; the machine will be restarted automatically after resetting
You can use your mobile phone client to update firmware for
the machine. Please connect it to the dock charger and ensure
that the battery capacity is more than 20% before update. The
power indicator is fast flashing in white during firmware update
IR decelerate sensor
* *
Restoring to Factory Defaults
If the system still doesn't work after resetting, please press
and hold the button simultaneously, until the system
prompts for "Start restoring initial version". The machine will
be restored to factory defaults in this way