Hi,
Just an update, remarkably my Chinese Vendor was able to supply the firmware.
I was concerned that it was going to be non-English and/or Pal but it is the English and NTSC version.
I had 6 cameras to flash - so I risked one, then completed the rest today.
The US supplier also emailed me back saying they were waiting for Dahua to respond.
I appreciate this forum being here.
I attempted to add the BIN file but it won't upload.
Please PM me and I will be happy to send it along.