Recently, there are some DVRs/NVRs with reminder of upgrading automatically. So you have to do as following step:
First,disconnect the Lan cable and reboot the devices.
Second, set a complex password.
Third, share us the version info. We will update the device by according firmware.
4th, by this steps the problem can be solve and then do like this: advaced>>>upgrade>>click “forbid remote upgrade”
Please try it .Thanks.