Firmware

DH_IPC-HX5X3X-Rhea_MultiLang_NP_Stream3_V2.800.0000018.0.R.210707.bin

Dahua firmware released Jul 7, 2021. May work with 325 devices, including IPC-EB5531, IPC-EB5531-AS, IPC-EB5531-M.

Download

Permanent copy on the Internet Archive (item page)

Hardware IDs this firmware's installer accepts (325 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, 325 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: 16 partitions, 10 written by this firmware

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

Partition	Start	End	Size	Image	Filesystem	Built
MinBoot	0x0	0x40000	256.0 KB	dhboot-min.bin.img	—	2021-07-07
U-Boot	0x80000	0xc0000	256.0 KB	dhboot.bin.img	—	2021-07-07
hwid	0xc0000	0xe0000	128.0 KB	not written	—	—
partition(ro)	0xe0000	0xf0000	64.0 KB	partition-x.cramfs.img	cramfs	2021-07-07
user(ro)	0xf0000	0x1000000	15.1 MB	user-x.squashfs.img	squashfs	2021-07-07
half-boot	0x1000000	0x1040000	256.0 KB	dhboot-min-halfstart.bin.img	—	2021-07-07
Kernel	0x1040000	0x1200000	1.8 MB	kernel.img	—	2021-07-07
web(ro)	0x1200000	0x1880000	6.5 MB	web-x.squashfs.img	squashfs	2021-07-07
product(ro)	0x1880000	0x18a0000	128.0 KB	pd-x.squashfs.img	squashfs	2021-07-07
custom(ro)	0x18a0000	0x1970000	832.0 KB	custom-x.squashfs.img	squashfs	2021-07-07
data	0x1970000	0x1a70000	1.0 MB	not written	jffs2	—
updateflag	0x1a70000	0x1aa0000	192.0 KB	not written	—	—
config	0x1aa0000	0x1b10000	448.0 KB	not written	jffs2	—
backup	0x1b10000	0x1b80000	448.0 KB	not written	jffs2	—
romfs(ro)	0x1b80000	0x1fd0000	4.3 MB	romfs-x.squashfs.img	squashfs	2021-07-07
dgs	0x1fd0000	0x2000000	192.0 KB	not written	—	—

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