Hi John,
The issue was on an older version HDCVI 16 channel and my client advised me 1 week ago.
I immediately consulted my supplier and asked if there were any "known issues" with the "hacked" scenario, and they took a whole of 10min to call me back with advice on a firmware upgrade followed by factory default and then reset up of DVR.
I received the firmware via email, downloaded to USB, went to site and had the issue resolved in around a 3 hour same day turnaround.
Client appreciated the resolution from manufacturer to supplier and my support.
I have had outstanding support from my supplier and Dahua as a whole and cannot commend them enough.
Regards,
Shane Lott