ASUS RT-AX1800S v2

multiple revisions of this device, use caution

abgn+ac+ax (AX1800)
AX1800 Dual Band Wi-Fi 6 Router
Wikipedia	Asus routers
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	ASUS RT-AX1800S v2
FCC ID (fcc.io)	none specified
FCC ID (fcc.report)	none specified
Type	wireless router
CPU1 Y	MediaTek MT7981B
CPU1 Type	ARM Cortex-A53
CPU1 Speed	1.3 GHz ( 2 cores ) 64-bit
Flash1 Chip	Winbond W25N01KVZEIR
Flash1 Size	128 MiB134,217,728 B <br />1,048,576 Kib <br />131,072 KiB <br />1,024 Mib <br />0.125 GiB <br /> (SPI NAND)
RAM1 Size	256 MiB268,435,456 B <br />2,097,152 Kib <br />262,144 KiB <br />2,048 Mib <br />0.25 GiB <br /> (DDR3L)
RAM1 Chip	Winbond W632GU6NB-09
ETH chip1	MediaTek MT7981B
Switch	MediaTek MT7531AE
Ethernet Port Count	1-1GbE-WAN 4-1GbE-LAN
Wired Standard	IEEE 802.3i/3u/3ab
802dot11 OUI: none specified
Stock bootloader	U-Boot
Expansion IF types	none specified
Power	12 VDC, 1.5 A
Connector type	barrel
Serial Port (UART)	yes, 3.3V TTL, (115200 8N1)
Other
3rd Party Firmware Support	OpenWrt • (List | Dev | DLs)
Radio 1
Chip1	MediaTek MT7981B
Chip2	MediaTek MT7976DAN
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
802.11a	up to 54 Mbps
WiFi Operating Frequency	2.4 GHz
Radio 2
Chip1	MediaTek MT7981B
Chip2	MediaTek MT7976DAN
Wireless interface OUI	none specified
Antenna Connector Type	MHF4
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
CPU1 brand Radio1 chip1 brand Radio2 chip1 brand ASUS RT-AX1800 Broadcom Broadcom Broadcom ASUS RT-AX1800S MediaTek MediaTek MediaTek ASUS RT-AX1800S v2 MediaTek MediaTek MediaTek ASUS RT-AX1800U MediaTek MediaTek MediaTek

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

For a list of all currently documented ASUS devices with specifications, see ASUS.

• 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

Target: mediatek
Subtarget: filogic
Package architecture: aarch64_cortex-a53
Supported Since Commit
Support started version: 25.12.0
Current supported version: 25.12.1

LAN Hardware: MediaTek MT7531AE
WLAN Hardware: MediaTek MT7981B, Mediatek MT7976DAN
WLAN Comment: MIMO 2x2:2 on both bands
Installation method(s):
see git-commit
Recovery method(s):
see git-commit
Comment:
Multiple models with identicle hardware and firmware images: RT-AX57M / RT-AX54HP V2 / RT-AX1800HP V2 / RT-AX1800S V2 / RT-AX3000S

RT-AX57M
RT-AX54HP V2
RT-AX1800HP V2
RT-AX1800S V2
RT-AX3000S
All above model use the same firmware and have identical hardware (as per commit)

git • >>

mediatek: filogic: Add support ASUS RT-AX57M ASUS RT-AX57M, RT-AX54HP V2, RT-AX1800HP V2, RT-AX1800S V2, and RT-AX3000S all use the same firmware and have identical hardware Hardware -------- SOC: MediaTek MT7981b RAM: 256MB DDR3L (Winbond W632GU6NB-09) FLASH: 128MB SPI-NAND (Winbond W25N01KVZEIR) WIFI: Mediatek MT7981b + Mediatek MT7976DAN 802.11ax 2.4/5 GHz ETH: MediaTek MT7531AE Switch UART: 3V3 115200 8N1 (Pinout silkscreened / Do not connect VCC) MAC addresses ------------- LAN Label MAC (stored in mtd ubi Factory partition at offset 0x4) WAN LAN 2.4G LAN + 2 in first octet 5G LAN Installation ----------------------------------------------------------- Vendor-UI Method ----------------------------------------------------------- 1. Download the OpenWrt initramfs.trx image. 2. Connect the PC via LAN to one of the yellow router ports and wait until your PC to get a DHCP lease. 3. Browse to http://192.168.1.1 (or whatever your router IP is configured as) 4. If your router is brand new, finish the setup process and log into the Web-UI. 5. Navigate to Administration -> Firmware Upgrade and upload the downloaded OpenWrt initramfs.trx image. 6. Wait for OpenWrt to boot. Open the default OpenWrt IP in a web browser and perform a system upgrade using the sysupgrade image as instructed in the top banner. --------------------------------------------------------------------------- Revert to stock firmware: 1: Install package facinstall -> https://forum.openwrt.org/t/facinstall-package-for-easy-installation-factory-images/177587 2. Install Asus stock trx image via OpenWRT LuCI interface.