Firmware

DH_SD-Yin-Demeter_EngSpnFrn_N_Stream3_V2.422.0001.0.R.20161208.bin

Dahua firmware released Dec 8, 2016. May work with 3 devices, including SD6A8240-HNI, SD6A9130-HNI, SD6C1230-HN.

Download

Permanent copy on the Internet Archive (item page)

Hardware IDs this firmware's installer accepts (3 devices).

Where these IDs come from

Install: the installer's device list (board families), 3 IDs, vendor General (not counted: a more specific list exists)
check.img: the device's own hardware check list, 3 IDs

Read from inside the firmware (dahua package (zip variant)).

Supported languages (3)

English, Spanish, French

Flash layout: 14 partitions, 8 written by this firmware

From the firmware's partition table (partition.txt).

Partition	Start	End	Size	Image	Filesystem	Built
U-Boot	0x80000	0xc0000	256.0 KB	dhboot.bin.img	—	2016-12-08
hwid	0xc0000	0x100000	256.0 KB	not written	—	—
partition	0x100000	0x140000	256.0 KB	partition-x.cramfs.img	cramfs	2016-12-08
custom	0x140000	0x2c0000	1.5 MB	custom-x.squashfs.img	squashfs	2016-12-08
product	0x2c0000	0x440000	1.5 MB	pd-x.squashfs.img	squashfs	2016-12-08
Kernel	0x440000	0x840000	4.0 MB	kernel.img	—	2016-12-08
romfs	0x840000	0xd40000	5.0 MB	romfs-x.squashfs.img	squashfs	2017-03-07
web	0xd40000	0x1700000	9.8 MB	web-x.squashfs.img	squashfs	2016-12-08
autoFix	0x1700000	0x1780000	512.0 KB	not written	—	—
autoFixBackup	0x1780000	0x1800000	512.0 KB	not written	—	—
syslog	0x1800000	0x1b00000	3.0 MB	not written	—	—
config	0x1b00000	0x1d80000	2.5 MB	not written	—	—
backup	0x1d80000	0x2000000	2.5 MB	not written	—	—
user	0x2000000	0x4000000	32.0 MB	user-x.squashfs.img	squashfs	2017-03-07

Other files for much of the same hardware, from any vendor.