Edimax EW-7478AC

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The Edimax is an AC1200 Wall-Wart access point. It has 1 Gigabit Ethernet port and 2 external antennas. It is now also sold under the name Edimax Gemini RE11 as a pair of range extenders and as RE11S as as a single range extender. The firmware for the EW-7478AP can be flashed also onto these devices, see the installation instructions below. The device is also compatible with the EW-7476RPC, which has internal instead of the external antennas.

Generic Router

Install OpenWrt (generic explanation)

Download the sysupgrade.bin file. Depending on the branding, you need to edit a magic number at the beginning of the binary file with a hex-editor (e.g. hexer on Linux). The original Edimax model has RN70 starting at file position 0x0c. If you want to flash the OpenWrt firmware for the first time on a rebranded model, you need to edit this magic number to match the magic number you can find at the beginning of the orignal vendor's firmware upgrade file. For the Edimax Gemini RE11 and RE11S modles, the magic number is RN74.

Address Layout:

0x0 Bootloader: u-boot
0x3000 Flash Hardware settings: u-boot-env
0x4000 Flash Default Settings: factory
0x5000 cimage
0x7000 Linux image flash offset start
0x80000 End of 8192KB flash

FIXME The instructions below are for Broadcom devices and only serve as an example.
Remove / modify them if they do not apply to this particular device!

This section deals with

  • How you install OpenWrt from a device freshly opened
  • The steps required such as reset to factory defaults if the device has already been configured

Note: Reset router to factory defaults if it has been previously configured.

  • Browse to
  • Upload .bin file to router
  • Wait for it to reboot
  • Telnet to and set a root password, or browse to if LuCI is installed.

Specific values needed for tftp

When using UART serial console, there are no specific values needed for this device, the U-Boot bootloader allows you to set the device's own IP address and the address of the tftp server. It also allows you to enter the name of the image to transfer.

There are client and server TFTP upload modes available. By default, U-Boot loads in server mode, to enter client mode:

  • power off the device
  • press and hold WPS button
  • power on the device
  • release WPS button after 5 seconds

In client mode device IP address is set to

In some cases to restore original firmware after OpenWRT installation you have to edit a magic number at the beginning of the binary file with a hex-editor (e.g. hexer on Linux). The original Edimax firmware has RN70 starting at file position 0x0c, for some models it may be changed to RN74.


FIXME These are generic instructions. Update with your router's specifics.

  • Browse to LuCI Upgrade URL
  • Upload image file for sysupgrade to LuCI
  • Wait for reboot

If you don't have a GUI (LuCI) available, you can alternatively upgrade via the command line. There are two command line methods for upgrading:

  • sysupgrade
  • mtd

Note: It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.


  • Login as root via SSH on, then enter the following commands:
cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
sysupgrade /tmp/xxx.abc


If sysupgrade does not support this router, use mtd.

  • Login as root via SSH on, then enter the following commands:
cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
mtd write /tmp/xxx.abc linux && reboot

Basic configuration After flashing, proceed with this.
Set up your Internet connection, configure wireless, configure USB port, etc.

The default network configuration is:

Interface Name Description Default configuration
br-lan LAN & WiFi
vlan0 (eth0) LAN ports None
wlan0 WiFi (5GHz) Disabled
wlan1 WiFi (2.4GHz) Disabled

As there is only 1 Ethernet port, there is nothing you can configure on the switch.

hardware.button on howto use and configure the hardware button(s). Here, we merely name the buttons, so we can use them in the above Howto.

The Edimax EW-7478AC has the following buttons:

WPS reset
Switch WiFi Off, 50%, 100% Not configured

Insert photo of front of the casing

Insert photo of back of the casing

Backside label:
Insert photo of backside label

Opening this device exposes
parts under high voltage (110/230 VAC)!

  • Risk of deadly electrical shock
  • Risk of irreversable damage to other components attached, e.g. your PC connected via serial

Make sure to keep your fingers, conductive tools and serial cables away from the high voltage at all times!

Capacitors can still retain dangerous voltages
after disconnection from mains!

Continue at your own risk!

Note: This will void your warranty!

To open the case, remove the sticker at the back of the device with the default login setting. Remove the screw that was below the sticker. Pry open the lid from the backside of the device with a prying tool starting from one of the air outlets at the top or bottom of the device.

Main PCB:


Serial Port Pinout:

(TX) (GND) (RX) [VCC]

Serial connection baud rate for Edimax EW-7478AC 57600, 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



Space for additional notes, links to forum threads or other resources.

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  • Last modified: 2024/02/12 11:13
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