Firmware

DH_SD-Mao-Rhea_MultiLang_NP_Stream3_IVS_V2.800.0000000.6.R.210705.bin

Dahua firmware released Jul 5, 2021. May work with 13 devices, including CA-HZ1023UT, CA-HZ1031UT, CA-HZ2012T-S2.

Download

Permanent copy on the Internet Archive (item page)

Hardware IDs this firmware's installer accepts (13 devices).

Where these IDs come from

Install: the installer's device list (board families), 5 IDs, vendor General (not counted: a more specific list exists)
check.img: the device's own hardware check list, 13 IDs

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

Supported languages (13)

English, Italian, Spanish, Russian, French, German, Portuguese, Polish, Korean, Czech, Dutch, Arabic, SpanishEU

Flash layout: 15 partitions, 9 written by this firmware

From the firmware's partition table (partitionV2.txt).

Partition	Start	End	Size	Image	Filesystem	Built
MinBoot	0x0	0x100000	1.0 MB	dhboot-min.bin.img	—	2021-07-05
U-Boot	0x200000	0x300000	1.0 MB	dhboot.bin.img	—	2021-07-05
hwid	0x300000	0x400000	1.0 MB	not written	—	—
updateflag	0x400000	0x500000	1.0 MB	not written	—	—
partition(ro)	0x500000	0x600000	1.0 MB	partition-x.cramfs.img	cramfs	2021-07-05
custom(ro)	0x600000	0x940000	3.3 MB	custom-x.squashfs.img	squashfs	2021-07-05
product(ro)	0x940000	0xc80000	3.3 MB	pd-x.squashfs.img	squashfs	2021-07-05
Kernel	0xc80000	0x1200000	5.5 MB	kernel.img	—	2021-07-05
romfs(ro)	0x1200000	0x1600000	4.0 MB	romfs-x.squashfs.img	squashfs	2021-07-05
web(ro)	0x1600000	0x1e00000	8.0 MB	web-x.squashfs.img	squashfs	2021-07-05
user(ro)	0x1e00000	0x3a80000	28.5 MB	user-x.squashfs.img	squashfs	2021-07-05
lens	0x7100000	0x7200000	1.0 MB	not written	—	—
syslog	0x7200000	0x7600000	4.0 MB	not written	ubi	—
config	0x7600000	0x7a00000	4.0 MB	not written	ubi	—
backup	0x7a00000	0x7e00000	4.0 MB	not written	ubi	—

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