Interesting. What's the failure? Does the camera work correctly as a QSee?
It could be that the QSee software has code to keep you from flashing a QSee to Dahua firmware, and is preventing you from changing.
In that case, you'd need to do the TFTP update from the full software package, which requires a special serial cable. So far, this is only availalbe from Dahua suppliers; I don't know of any end users who have used this system yet.
The Camera is not fully functional but works with less features at least. If I try to flash, the web gui uploades the firmware but hangs after that. If I try it by the Config Tool it doesn't work either....