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Asus EA-N66

Supported Versions

Version/Model S/N OpenWrt Version Supported Model Specific Notes
1.20 - ? Red PCB
1.30 - ? Blue PCB

Hardware Highlights

CPU Ram Flash Network Gigabit USB Serial JTag
RT3883F @ 500MHz (MIPS 74Kc) 32MiB 4MiB 1 Yes No Yes ?


You can flash the router from a PC using the Firmware Restoration utility or via TFTP.

To put the EA-N66 in recovery mode, disconnect power from the router first, then hold the reset button (pinhole button below the EA-N66) while powering on.

The antenna lights will slowly alternate between dim and bright to signal that the router is waiting for a firmware to be uploaded.

The router IP in recovery mode is and your PC should be configured as (the router sends ARP requests to before accepting a TFTP flash).

Ping should give a response; you can then proceed to upload new firmware using the Firmware Restoration utility or TFTP to

After taking a few minutes to flash, the EA-N66 will reboot itself into the new firmware; if it is not responding over the network, your firmware probably did not boot successfully.



Architecture: MIPS
Vendor: Ralink
System-On-Chip: RT3883F (MIPS 74Kc V?.?)
CPU/Speed MIPS 74Kc @ 500 Mhz
Flash-Chip: MX29LV320EBTI-70G
Flash size: 4096 KiB
RAM: 32 MiB
Wireless: Ralink RT3883F
Ethernet: RealTek RTL8211E Gigabit
Serial: Yes

Flash Layout

# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00400000 00010000 "ALL"
mtd1: 00030000 00010000 "Bootloader"
mtd2: 00010000 00010000 "Config"
mtd3: 00010000 00010000 "Factory"
mtd4: 003b0000 00010000 "Kernel"


Asus EA-N66 PCB top Asus EA-N66 PCB bottom

Opening the case

Note: This may void your warranty!

There are 3 screws hidden below the 3 rubber feet. Unscrew them and gently pry the bottom plate off. Disconnect the 3 antenna connectors and the PCB can be removed.


J12 is the TTL 3.3V serial port and its pinout is labelled on the reverse side of the connector.

Asus EA-N66 serial port

Boot Log

Stock firmware

Booting AA beta build for RT-N56U (it boots partially)

Other Info


toh/asus/ea-n66.txt · Last modified: 2018/03/31 23:23 by bobafetthotmail