AVM FRITZ!Box 4040 is a versatile home router, supporting 802.11ac Wi-Fi and Gigabit Ethernet but has no integrated modem. Instead, the WAN port can be connected to several types of upstream modems like fiber, cable or DSL.

When this device is powered on, the EVA bootloader allows FTP connection attempts during a certain time frame. The FTP server can be reached at IP 192.168.178.1, so give your workstation the IP 192.168.178.2 and try to connect to the recently powered on device after a few seconds.

$ ftp -n -v -p 192.168.178.1
Connected to 192.168.178.1 (192.168.178.1).
220 ADAM2 FTP Server ready
ftp> quote USER adam2
331 Password required for adam2
ftp> quote PASS adam2
230 User adam2 successfully logged in
ftp> quote MEDIA FLSH
200 Media set to MEDIA_FLASH
ftp> binary
200 Type set to BINARY
ftp> put openwrt-18.06.1-ipq40xx-avm_fritzbox-4040-squashfs-eva.bin mtd1
local: openwrt-18.06.1-ipq40xx-avm_fritzbox-4040-squashfs-eva.bin remote: mtd1
227 Entering Passive Mode (192,168,178,1,12,0)
150 Opening BINARY data connection
226 Transfer complete
5505028 bytes sent in 24,7 secs (223,21 Kbytes/sec)
ftp> quote check mtd1
150 Flash check 0x9F288C3D

Give it the image file you want to flash in the put command. After it displays something like “150 Flash check 0x…” the procedure is done. It will not terminate automatically, so power-cycle the device.

Note: If you like to ensure there are no configuration leftovers from the previously installed firmware, reset it to factory defaults before flashing.

if you get an error “502 command not implemented” use the command passive after binary.

If you want to go back to stock firmware, download the .image file from AVM's website linked above in the box. Rename the file extension to .tar, extract the archive and find the file var/tmp/kernel.image. Use the FTP flashing procedure above and give the put command the kernel.image file.

Alternatively, AVM offers a recovery tool for Windows.

→ generic.sysupgrade

cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
sysupgrade /tmp/xxx.abc

cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
mtd write /tmp/xxx.abc linux && reboot

→ generic.debrick

→ failsafe_and_factory_reset

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

→ 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.

Front:
Insert photo of front of the casing

Back:
Insert photo of back of the casing

Backside label:
Insert photo of backside label

Note: This will void your warranty!

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

→ 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

→ bootloader

None so far.

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

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