SIM SIMAX1800U

multiple revisions of this device, use caution

abgn+ac+ax (AX1800)
wireless router
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	SIM SIMAX1800U
FCC ID	none specified
Type	wireless router
CPU1 Y	MediaTek MT7621AT
CPU1 Type	MIPS 1004Kc
CPU1 Speed	800 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 /> (NAND)
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 /> (DDR3)
RAM1 Chip	Brand? Model?
ETH chip1	MediaTek MT7621AT
Switch	MediaTek MT7621AT
Ethernet Port Count	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 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 MT7905
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 MT7905
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
CPU1 brand Radio1 chip1 brand Radio2 chip1 brand SIM SIMAX1800T MediaTek MediaTek MediaTek SIM SIMAX1800U MediaTek Mediatek Mediatek

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

Target: ramips
Subtarget: mt7621
Package architecture: mipsel_24kc
Supported Since Commit
Support started version: 25.12.0
Current supported version: 25.12.2

LAN Hardware: MediaTek MT7530
WLAN Hardware: MediaTek MT7905D, MediaTek MT7975D
WLAN Comment: 2.4GHz: 2x2:2 MIMO, 5GHz: 2x2:2 MIMO
Installation method(s):
see git-commit
Recovery method(s):
see git-commit

git • >>

SIM SIMAX1800U has the similar hardware design as the SIMAX1800T. The only difference is the Ethernet portmap. Specification ------------- - SoC  : Mediatek MT7621 - RAM  : 256 MiB DDR3 - Flash  : 128 MiB NAND Flash - WLAN  : Mediatek MT7905 DBDC - 2.4 GHz : 2x2 MIMO WiFi6 - 5 GHz  : 2x2 MIMO WiFi6 - Ethernet  : MT7621 built-in 10/100/1000 Mbps 1x WAN; 3x LAN - UART  : 3.3V, 115200n8 - Buttons  : 1x RESET; 1x WPS/MESH - LEDs  : 1x Multi-Color(Blue;Green;Red) - Power  : DC 12V1A - CMIIT ID  : 2022AP7163 - TFTP IP  : - server  : 192.168.1.254 - router  : 192.168.1.28 TFTP Installation(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. Remove all Ethernet cables and WiFi connections from the PC, except for the one connected to the SIMAX1800U. Start the TFTP server, plug in the power adapter and wait for the OpenWrt system to boot. 4. Backup "firmware" partition and rename it to "firmware.bin". We need it to back to the stock firmware. 5. Use "fw_printenv" command to list envs. If "firmware_select=2" is observed then set u-boot env variable via command: `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 env variable via command: `fw_setenv firmware_select 1` 3. Apply squashfs-sysupgrade.bin in OpenWrt LuCI. Return to Stock Firmware ---------------------------- Restore the backup firmware partition in the installation step 4. MAC addresses ------------- +---------+-------------------+ | | MAC example | +---------+-------------------+ | LABEL | 98:xx:xx:xx:xx:b2 | | LAN | 98:xx:xx:xx:xx:b5 | | WAN | 98:xx:xx:xx:xx:b2 | | WLAN2G | 98:xx:xx:xx:xx:b4 | | WLAN5G | 9a:xx:xx:xx:xx:b4 | +---------+-------------------+ Tips: ----------- User can use `TFTP Installation` method to recover a brick device.