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Asus RT-N66

Devices with Broadcom WiFi chipsets have limited OpenWrt supportability (due to limited FLOSS driver availability for Broadcom chips). Consider this when chosing a device to buy, or when deciding to flash OpenWrt on your device because it is listed as supported. See broadcom_wifi for details.

Supported Versions

Version/Model Launch Date Model Specific Notes
B1 2013 commonalities with the Netgear WNDR4500
B2 2014 HW same as B1, different CFE version

The RT-N66U and RT-N66W are the same except U has a black case and W has a white case.

The RT-N66R is the same as the RT-N66U. It is simply a repackage for retail sale.

Please notice that due to Broadcom BCM47xx driver limitations wireless support is sketchy.

In Chaos Calmer r45879, 5 GHz is disabled and 2.4 GHz is very weak (see:

Hardware Highlights

ModelVersionSoCCPU MHzFlash MBRAM MBWLAN HardwareWLAN2.4WLAN5.0Gbit portsModemUSB
RT-N66UB1, B2Broadcom BCM470660032256Broadcom BCM4331b/g/na/n5-2x 2.0




Architecture MIPS
Vendor Broadcom
bootloader CFE
System-On-Chip Broadcom BCM4706 (MIPS32 74K)
CPU/Speed Broadcom BCM5300 chip rev 1 pkg 0 (MIPS 74K V4.9)@ 600 MHz
Flash-Chip Spansion S29GL256P10TF101
Flash size 32 MiB
RAM 256 MiB
Wireless Broadcom BCM4331 802.11n dual band 3×3
Ethernet Broadcom BCM53125SKMML
USB Yes 2 x 2.0
Serial Yes


port.serial general information about the serial port, serial port cable, etc.

How to connect to the Serial Port of this specific device:
Insert photo of PCB with markings for serial port

FIXME Replace EXAMPLE by real values.

Serial connection parameters
for Asus RT-N66
EXAMPLE 115200, 8N1


port.jtag general information about the JTAG port, JTAG cable, etc.

How to connect to the JTAG Port of this specific device:
Insert photo of PCB with markings for JTAG port

MicroSD Card

To use the MicroSD card slot that is on the motherboard you must install the kmod-usb-core, kmod-usb-ohci, kmod-usb-uhci, kmod-usb2 packages, plus those for the filesystem you would like to use


toh/asus/rt-n66u.txt · Last modified: 2018/06/02 08:45 by tmomas