Would appreciate some help please. My NVR DS-7204HQHI-K1/p is saying my status is offline despite it being connected to the internet. I have rebooted several times, disconnected, tried to upgrade firmware and the only firmware succeeded is V3.5.371 build 181220 but still saying offline and that also affects ability to connect the mobile app as it cannot connect to the device. I can only connect to the DVR via my computer at home. Any help would be appreciated and the specific firmware that can work.