Camera disconnected

I have two identical DS-2CD2132-I cameras connected to a Synology NAS. Last week I updated the NAS to the latest version of DSM and Surveillance Station. This immediately caused one of the cameras to become disconnected.

I can still ping the disconnected camera and it is seen by the SADPtool, but I can't log into it. I have contacted Synology and they have said to update the camera firmware, but I can't get into the camera to do it.

Any ideas please?

Thanks,

Danny