AVM FRITZ!WLAN Repeater 1750E

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AVM Fritz Repeater 1750e

Initial installation is done via FTP. You will need the following components to get started:

  • A computer with ftp command line utility and Ethernet port.
  • 1–2 Ethernet cable/s
  • (recommended) Ethernet switch
  • OpenWrt firmware image, e.g. openwrt-21.02.0-rc1-ath79-generic-avm_fritz1750e-squashfs-sysupgrade.bin

Please read through all steps before beginning the process and make sure you understand the procedure.

  1. Connect your computer and the repeater to the Ethernet switch
    • If you have no switch at your disposal you can try a direct connection. It might be tricky though to persuade your computer into assigning the IP address in time to establish the FTP connection within the available time frame.
  2. Configure your computer with a static IP address in the subnet, e.g.
  3. Plug the repeater into the power outlet and continue as soon as you see LEDs glowing on the device.
  4. Connect to the repeater using the ftp command with its IP address
    • On Debian (and many other Linux distributions) you can e.g. use ftp -pnvd This will automatically activate debug and passive modes.
    • If you use -pnvd, don't run the debug and passive commands in the ftp client.
  5. Execute the following commands within the FTP session:
    • Replace openwrt-21.02.0-rc1-ath79-generic-avm_fritz1750e-squashfs-sysupgrade.bin with the path to your upgrade image.
    • Make sure your OpenWrt image is in your working directory or, e.g., use the absolute path.
quote USER adam2
quote PASS adam2
put openwrt-21.02.0-rc1-ath79-generic-avm_fritz1750e-squashfs-sysupgrade.bin mtd1

After you read 226 Transfer complete you can disconnect the repeater from the power outlet.

FIXME Find out flash layout, then add the flash layout table here (copy, paste, modify the example).

Please check out the article Flash layout. It contains examples and explanations that describe how to document the flash layout.

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

FIXME Enter values for “FILL-IN” below

Bootloader tftp server IPv4 address FILL-IN
Bootloader MAC address (special) FILL-IN
Firmware tftp image Latest OpenWrt release (NOTE: Name must contain “tftp”)
TFTP transfer window FILL-IN seconds
TFTP window start approximately FILL-IN seconds after power on
TFTP client required IP address FILL-IN


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

This section explains how to restore original OEM firmware if the device is flashed with OpenWrt or the firmware is bricked.

You will need the following items:

  • A computer with Wine (wine32) installed (tested w/ version 4.0) and an Ethernet port.
  • Ethernet cable
  • AVM recovery utility (Download), e.g. FRITZ.Repeater_1750E-07.21-recover.exe

The following steps are necessary to restore your repeater:

  1. Prepare your NetworkManager with a static Ethernet connection
    • Use a static IP address in the subnet, e.g.
  2. Keep the repeater off the power socket and connect the Ethernet cable with your computer
  3. Run the recovery utility, e.g. by executing wine FRITZ.Repeater_1750E-07.21-recover.exe
  4. Click “weiter” until a window pops up
  5. Select your Ethernet adapter in the pop-up window (“übernehmen”) and continue with “ok”
  6. The utility will now wait for the repeater to become available
  7. Connect the repeater to the power outlet and as soon as possible select the prepared static IP profile with NetworkManager
    • The utility should log the process of deleting this and flashing that
    • After some minutes the repeater is restored and you can close the utility
    • (If the connection fails you can use an Ethernet switch as described in the OpenWrt install procedure above to get a steady connection)
  8. The repeater can be unplugged from the power outlet and will boot OEM Fritz!OS next time it is connected


Use the OpenWrt FTP install process or OEM Restore described above to restore the repeater if the firmware is bricked.

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

FIXME Please fill in real values for this device, then remove the EXAMPLEs

The default network configuration is:

Interface Name Description Default configuration
vlan0 (eth0.0) EXAMPLE LAN ports (1 to 4) EXAMPLE None
vlan1 (eth0.1) EXAMPLE WAN port EXAMPLE DHCP

FIXME Please fill in real values for this device, then remove the EXAMPLEs

Numbers 0-3 are Ports 1-4 as labeled on the unit, number 4 is the Internet (WAN) on the unit, 5 is the internal connection to the router itself. Don't be fooled: Port 1 on the unit is number 3 when configuring VLANs. vlan0 = eth0.0, vlan1 = eth0.1 and so on.

Port Switch port
Internet (WAN) EXAMPLE 4

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.

FIXME Please fill in real values for this device, then remove the EXAMPLEs

The AVM FRITZ!WLAN Repeater 1750E has the following buttons:

EXAMPLE Reset reset
EXAMPLE Secure Easy Setup ses
EXAMPLE No buttons at all. -

Front of the case

Back of the case

Bottom of the case

Backside label:
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!

FIXME Describe what needs to be done to open the device, e.g. remove rubber feet, adhesive labels, screws, ...

  • To remove the cover and open the device, do a/b/c

Main PCB:
Insert photo of PCB

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

Serial connection parameters
for AVM FRITZ!WLAN Repeater 1750E
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

None so far.



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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