A portable electronic device includes a transmission interface, a wireless communication circuit and microprocessor. The wireless communication circuit connects to a cloud server through the Internet. The microprocessor obtains firmware-version information and device-setting information of an electronic device through the transmission interface, and controls the wireless communication circuit to send the firmware-version information and the device-setting information to the cloud server. When the cloud server determines that the firmware version of the electronic device is not the latest firmware version according to the firmware-version information or determines that a device setting of the electronic device is not the latest device setting according to the device-setting information, the portable electronic device fetches the latest firmware information message and the latest device setting message from the cloud server, and transmits the latest firmware information message and the latest device setting message to the electronic device.