Unpack Dahua XVR firmware

[bugmenot01]

I'm trying to extract the main binary of dahua "Challenge" from the firmware with binwalk
link to device page
link to zip firmware:
But I can't find the "Challenge" binary, why is that?

When I tried to extract an old firmware link to firmware in this post I success to find Challlenge with binwalk in path

_DH_NVR7xxx_Eng_P_V3.200.0000.0.R.20160311.bin.extracted/_romfs-x.cramfs.img.extracted/cramfs-root/usr/bin/Challenge.7z

How can I extract "Challenge" binary from the new firmware?

 

[iTuneDVR]

1st decrypt head userfs-x.cramfs.img & then mount it ...
But 1st your need decrypt romfs-x.cramfs & then ...
But 1st your need open uImage....

Try to find another way

 

[bugmenot01]

1st decrypt head userfs-x.cramfs.img & then mount it ...
But 1st your need decrypt romfs-x.cramfs & then ...
But 1st your need open uImage....

Try to find another way

another way?

 

[iTuneDVR]

Yes