Communication system, management server, and device

A management server configured to communicate with a service server and a device used for a service,

• the management server comprising a server controller,
• the service server comprising a first storage area configured to store device information and user information in association with each other, the device information indicating the device, the user information indicating a user associated with the service,
• the device comprising a memory configured to store the device information and setting information, the setting information indicating a setting used for the service,
• the server controller configured to:
• in a particular case where a progress notification from the device is received by the management server, transmit, to the service server, an instruction to delete the device information from the first storage area of the service server, the progress notification being a notification transmitted by the device in response to progress of a reset process to a particular stage, the reset process including deleting the setting information from the memory of the device.

A device used for a service and configured to communicate with a server system, the device comprising:

• a device controller;
• and
• a memory configured to store device information and setting information, the device information indicating the device, the setting information indicating a setting used for the service,
• the device controller configured to:
• in response to a reset instruction by a user of the device, transmit a start notification to the server system, the start notification being a notification including the device information;
• in a case where a start response is not received by the device before a first waiting time elapses from transmission of the start notification, not start a reset process including deleting the setting information from the memory of the device, the start response being a response from the server system in response to the start notification;
• in a case where the start response is received by the device before the first waiting time elapses from the transmission of the start notification, start the reset process;
• in response to progress of the reset process to a particular stage, transmit a progress notification to the server system, the progress notification indicating the progress of the reset process to the particular stage;
• and
• in a particular case where a progress response is received by the device, perform a remainder of the reset process, the progress response being a response from the server system in response to the progress notification.