TP-Link TL-MR6400 v5

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TP-Link MR6400


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How to use LTE modem in QMI mode for WAN connection

The v21.02.3 image does not contain support for the built in LTE modem, however you can add this. Before installing any other packages, install luci-proto-uqmi and then download and install the following custom uqmi package:

opkg install uqmi_2022-05-16-0.5_mipsel_24kc.ipk

Add a new section to /etc/config/network for the modem, adding the correct APN required by your ISP:

config interface 'Broadband'
        option proto 'qmi'
        option device '/dev/cdc-wdm0'
        option apn '<insert your ISP's APN>'
        option auth 'none'
        option dhcp '0'
        option autoconnect '1'

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.

Flashing via OEM web interface does not work.


You can flash via tftp recovery:

  1. serve tftp-recovery image as tp_recovery.bin on
  2. connect to any ethernet port
  3. power on the device while holding the reset button
  4. wait at least 8 seconds before releasing reset button. After downloading the new firmware image, the power light should flash for about 3mins, then the device should reboot.

Specific values needed for tftp

Bootloader tftp server IPv4 address
Firmware tftp image Latest OpenWrt release (NOTE: Use the image containing the name“tftp” and rename it to tp_recovery.bin)
TFTP window start Power on the device while holding the RESET button for 8secs
Bootloader TFTP client IPv4 address


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
sysupgrade /tmp/


If sysupgrade does not support this router, use mtd.

  • Login as root via SSH on, then enter the following commands:
cd /tmp
mtd write /tmp/ 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 (eth0.1) LAN ports (1 to 3) None
vlan1 (eth0.2) LAN/WAN port DHCP
wlan0 WiFi Disabled
wwan0 Broadband Not configured

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
CPU (eth0) 0
LAN 1 1
LAN 2 2
LAN 3 3
LAN 4 / WAN 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.

The TP-Link TL-MR6400 has the following buttons:

Reset/WPS reset
WiFi On/Off ?

Insert photo of front of the casing

Insert photo of back of the casing

Backside label:
Insert photo of backside label

Note: This will void your warranty!

The backside is secured by just one screw, which is accessible by removing the right side of the label:

After having removed the screw, the panel is attached by plastic clips and can be pried open. See below for the position of the clips:

(Do this too often and/or apply too much force and these clips will break).

Main 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 TP-Link TL-MR6400 v5
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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