Haier HAR-20S2U1

abgn+ac+ax (AX1800)
Wi-Fi 6 AX1800 router
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	Haier HAR-20S2U1
FCC ID	none specified
Type	wireless router
CPU1 Y	MediaTek MT7621AT
CPU1 Type	MIPS 1004Kc
CPU1 Speed	880 MHz ( 2 cores ) 16-bit
Flash1 Chip	Brand? Model?
Flash1 Size	128 MiB 134,217,728 B <br />1,048,576 Kib <br />131,072 KiB <br />1,024 Mib <br />0.125 GiB <br />
RAM1 Size	256 MiB 268,435,456 B <br />2,097,152 Kib <br />262,144 KiB <br />2,048 Mib <br />0.25 GiB <br />
RAM1 Chip	Brand? Model?
ETH chip1	MediaTek MT7621AT
Switch	MediaTek MT7530
Ethernet Port Count	4-1GbE-LAN
Wired Standard	IEEE 802.3i/3u/3ab
802dot11 OUI: none specified
Expansion IF types	none specified
Power	12 VDC, 1.5 A
Serial Port (UART)	yes, 3.3V TTL, (115200 8N1)
Other
3rd Party Firmware Support	OpenWrt • (List | Dev | DLs)
Radio 1
Chip1	MediaTek MT7905DAN
Chip2	MediaTek MT7975DN
Wireless interface OUI	none specified
Antenna Connector Type	none specified
MIMO status	2x2:2
Wireless Standard	IEEE 802.11b/g/n/ax
802.11ax	up to 574 Mbps
802.11n	up to 300 Mbps
802.11g	up to 54 Mbps
802.11b	up to 11 Mbps
WiFi Operating Frequency	2.4 GHz
Radio 2
Chip1	MediaTek MT7905DAN
Chip2	MediaTek MT7975DN
Wireless interface OUI	none specified
Antenna Connector Type	none specified
MIMO status	2x2:2
Wireless Standard	IEEE 802.11a/n/ac/ax
802.11ax	up to 1201 Mbps
802.11ac	up to 867 Mbps
802.11n	up to 300 Mbps
802.11a	up to 54 Mbps
WiFi Operating Frequency	5 GHz

For a list of all currently documented MediaTek chipsets with specifications, see MediaTek.

• 574 Mbps - 2SS 2.4GHz 802.11ax (40MHz chan., 256-QAM),

• 1201 Mbps - 2SS 5GHz 802.11ax (80MHz chan., 1024-QAM) = AX1800 class

Flashing

Flashing OpenWrt

On the OpenWrt ToH (techdata entry)
On the OpenWrt Wiki
On the OpenWrt Forum

Target: ramips
Subtarget: mt7621
Package architecture: mipsel_24kc
Supported Since Commit
Support started version: 23.05.0
Current supported version: 25.12.3

LAN Hardware: MediaTek MT7530
WLAN Hardware: MediaTek MT7905DAN, MediaTek MT7975DN
WLAN Comment: 2×2: MU-MIMO, 2.4GHz 40Mhz, 5GHz 80Mhz
Installation method(s):
see devicepage
Install Comment:
More details on GitHub https://github.com/openwrt/openwrt/pull/10696
Recovery method(s):
see devicepage

git • >>

ramips: add support for SIM SIMAX1800T and Haier HAR-20S2U1 SIM AX18T and Haier HAR-20S2U1 Wi-Fi6 AX1800 routers are designed based on Tenbay WR1800K. They have the same hardware circuits and u-boot. SIM AX18T has three carrier customized models: SIMAX1800M (China Mobile), SIMAX1800T (China Telecom) and SIMAX1800U (China Unicom). All of these models run the same firmware. Specifications: SOC: MT7621 + MT7905 + MT7975 ROM: 128 MiB RAM: 256 MiB LED: status *3 R/G/B Button: reset *1 + wps/mesh *1 Ethernet: lan *3 + wan *1 (10/100/1000Mbps) TTL Baudrate: 115200 TFTP Server: 192.168.1.254 TFTP IP: 192.168.1.28 or 192.168.1.160 (when envs is broken) MAC Address: use address source label 30:xx:xx:xx:xx:62 wan lan 30:xx:xx:xx:xx:65 factory.0x8004 wan 30:xx:xx:xx:xx:62 factory.0x8004 -3 wlan2g 30:xx:xx:xx:xx:64 factory.0x0004 wlan5g 32:xx:xx:xx:xx:64 factory.0x0004 set 7th bit TFTP Installation (initramfs image only & recommend): 1. Set local tftp server IP: 192.168.1.254 and NetMask: 255.255.255.0 2. Rename initramfs-kernel.bin to "factory.bin" and put it in the root directory of the tftp server. (tftpd64 is a good choice for Windows) 3. Start the TFTP server, plug in the power supply, and wait for the system to boot. 4. Backup "firmware" partition and rename it to "firmware.bin", we need it to back to stock firmware. 5. Use "fw_printenv" command to list envs. If "firmware_select=2" is observed then set u-boot enviroment: /# fw_setenv firmware_select 1 6. Apply sysupgrade.bin in OpenWrt LuCI. Web UI Installation: 1. Apply update by uploading initramfs-factory.bin to the web UI. 2. Use "fw_printenv" command to list envs. If "firmware_select=2" is observed then set u-boot enviroment: /# fw_setenv firmware_select 1 3. Apply squashfs-sysupgrade.bin in OpenWrt LuCI. Recovery to stock firmware: a. Upload "firmware.bin" to OpenWrt /tmp, then execute: /# mtd -r write /tmp/firmware.bin firmware b. We can also write factory image "UploadBrush-bin.img" to firmware partition to recovery. Upload image file to /tmp, then execute: /# mtd erase firmware /# mtd -r write /tmp/UploadBrush-bin.img firmware How to extract stock firmware image: Download stock firmware, then use openssl: openssl aes-256-cbc -d -salt -in [Downloaded_Firmware] \ -out "firmware.tar.tgz" -k QiLunSmartWL Signed-off-by: Chen Minqiang Signed-off-by: Shiji Yang