I extracted some of the img files on the amcrest fw and found this device list:
"Devices" : [
[ "SD6XXX", "1.00" ],
[ "IPC-HX3XXX", "1.00" ],
[ "IPC-HX4XXX", "1.00" ],
[ "IPC-HX5XXX", "1.00" ],
[ "IPC-HX8XXX", "1.00" ]
],
I also tried reasearching dahua...