You need download the EZ Client software at frist,then you can upgrade the camera via EZ Client.
Download the correct firmware and choose it to upgrade your camera.
Firmware download link :https://drive.google.com/drive/folders/1xWA-DSRqayr_bSTTT8YKu4X9g127ABAY
2. Use the Ethernet cable connect the camera to your Router,then open EZ Client,click + Add device.
3. You will see the camera in the Device in LAN ,choose the camera and enter the password ,then click Add ,the camera will successfully add to the software.(Default user name and password is admin and 12345)
4. Click the setting icon of your camera.
5.Choose Upgrade icon --Click Browser --- Choose the accordingly firmware ---- Click upgrade.
Then wait a second ,it will come out the notification of upgrading successfully.