I used the method describe in the following thread: Dahua IPC EASY unbricking / recovery over TFTPExcellent!
So you just pushed the camera FW via the NVR interface, or did you have to use uart cable? (Like stated from a different user above?)
Thanks for the replies, much appreciated sir
Only hardware used was a laptop for TFTP, a standard cat5 Ethernet cable and power supplies for cameras and nvr.