then I did a restart from its web interface and its never come up again!
Not good - and odd.
From the PoE switch, it would appear as though its getting power,.. also looks like there's some network activity but nothing is helping.
So not totally dead then. But the network activity could be broadcasts from other devices on the network.
The serial number has CCCH in it, not sure if I was reading here or elsewhere where that might indicate it was a Chinese unit?
Yes, that's an indication it's a Chine region device.
Before I restarted had saved its details from SADP, it was/is running V5.2.0build 140721,.. however the box specifies V5.1.6
That's old firmware that will have the 'Hikvision backdoor' vulnerability. And will have UPnP enabled by default.
Is this guide still applicable to trying to get this unit resurrected ?
Quite likely - though it does depend on the cause of the problem.
There are various possibilities.
If the cable was self-terminated, that could be a cause if it's wired wrongly or a bad connection.
If the external cable joint was not fully sealed, moisture ingression / corrosion, especially with PoE, could be a cause.
Presumably you've tried other PoE ports, maybe even another PoE source.
Also possible - if your router has UPnP enabled - is that the camera has been hacked, though that usually results in a password change rather than something more malicious.
Generally, a 'bricked' DS-2CD3332-I will still show up on SADP with a firmware version of 4.0.8 which indicates it's running in the 'min-system recovery mode' so lack of visibility on SADP isn't a good sign.
However - if the camera still puts out the probe for the
tftp updater on power up, it should be recoverable, though the handshake with the tftp updater is less reliable when using a PoE connection.
Suggestion for a first test:
Install the Hikvision tftp updater tool -
TFTPServ
Drop a copy of the '5.3.0 to 5.2.5 downgrader' firmware into the same folder - from the second dropbox link here :
Custom Firmware Downgrader 5.3.0 Chinese to 5.2.5 English
Disconnect the camera ethernet cable from the PoE switch.
With the PC wired, not on WiFi, set the PC IP address to 192.0.0.128 , start the tftp updater, allow the firewall request.
Re-connect the camera ethernet cable to the PoE switch.
Watch for status messages in the tftp updater window.
With any luck you will see some activity, maybe even 'system update completed'.
If you do - then the full brickfixV2 method can be followed to convert the camera to EN and fully update the firmware to a version that does not have the Hikvision backdoor vulnerability.
Good luck!