ZyXEL Keenetic Challenger SE (KN-3911)

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abgn+ac+ax (AX3000)
AX3000 Mesh Wi-Fi 6 Multi-Gigabit Router/Extender
Homepage Product page
3rd Party Firmware
dd-wrt Status Unknown
OpenWrt Supported
Tomato any flavor Incompatible
Gargoyle Status Unknown
Platform
BrandModelRev Keenetic Challenger SE
Model Part Number KN-3911
FCC ID (fcc.io) none specified
FCC ID (fcc.report) none specified
Type range extender
CPU1 checkY MediaTek MT7981BA
CPU1 Type ARM Cortex-A53
CPU1 Speed 1.3 GHz ( 2 cores ) 64-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 /> (SPI NAND)
RAM1 Size 512 MiB 536,870,912 B <br />4,194,304 Kib <br />524,288 KiB <br />4,096 Mib <br />0.5 GiB <br />
RAM1 Chip Brand? Model?
ETH chip1 MediaTek MT7981BA
ETH chip2 Airoha EN8811H
ETH chip3 Airoha EN8811H
Ethernet Port Count 2-2.5GbE-LAN
Wired Standard IEEE 802.3i/3u/3ab/3bz

802dot11 OUI: none specified

Stock bootloader U-Boot
Expansion IF types none specified
Power 12 VDC, 1.5 A
Connector type barrel

Flags:
Wi-Fi 6

Other
3rd Party Firmware Support OpenWrt • (List | Dev | DLs)
Radio 1
Chip1 MediaTek MT7981BA
Chip2 MediaTek MT7976CN
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 MT7981BA
Chip2 MediaTek MT7976CN
Wireless interface OUI none specified
Antenna Connector Type none specified
MIMO status 2x3:2
Wireless Standard IEEE 802.11a/n/ac/ax
AX-QAM up to 2402 Mbps
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 Airoha (EcoNet) chipsets with specifications, see Airoha.
For a list of all currently documented MediaTek chipsets with specifications, see MediaTek.

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

574 Mbps - 2SS 2.4GHz 802.11ax (40MHz chan., 1024QAM),
2402 Mbps - 2SS 5GHz 802.11ax (160MHz chan., 1024QAM) = AX3000 class

Flashing

Flashing OpenWrt

Target: mediatek
Subtarget: filogic
Package architecture: aarch64_cortex-a53
Supported Since Commit
Support started version: 24.10.0
Current supported version: 25.12.0
LAN Hardware: MediaTek MT7981B
LAN Comment: 2x Airoha EN8811H 2.5Gbe Phy
WLAN Hardware: MediaTek MT7981B, MediaTek MT7976CN
Installation method(s):
see git-commit
Recovery method(s):
see git-commit
git • >>
mediatek/filogic: add Keenetic KN-3911 support
Specification:
 - MT7981 CPU using 2.4GHz and 5GHz WiFi (both AX)
 - 512MB RAM
 - 128MB SPI NAND
 - 2 LEDs (green, orange)
 - 3 buttons (fn, reset, wps)
 - 2 2.5Gbit ethernet ports based on Airoha EN8811H phy

Serial Interface:
 - 3 Pins GND, RX, TX
 - Settings: 115200, 8N1

Notes:
 - The device supports dual boot mode

Flash instruction:
The only way to flash OpenWrt image is to use tftp recovery mode in U-Boot:

1. Configure PC with static IP 192.168.1.2/24 and tftp server.
2. Rename "openwrt-mediatek-filogic-keenetic_kn-3911-squashfs-factory.bin"
   to "KN-3911_recovery.bin" and place it in tftp server directory.
3. Connect PC with ethernet port, press the reset button, power up
   the device and keep button pressed until status led start blinking.
4. Device will download file from server, write it to flash and reboot.

See also

Keenetic series