TP-LINK TL-WR840N v4

multiple revisions of this device, use caution
bgn (N300)
	300Mbps Wireless Router
Homepage	Product page
Support	Support page
Wikipedia	TP-Link
WikiDevi.wi-cat.ru	TP-LINK TL-WR840N v4
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	TP-LINK TL-WR840N v4
FCC ID	TE7WR841NV13
Board ID	2050500850
Type	wireless router
CPU1	MediaTek MT7628N
CPU1 Type	MIPS 24KEc
CPU1 Speed	575 MHz 32-bit
Flash1 Chip	GigaDevice GD25Q64B
Flash1 Size	8 MiB 8,388,608 B <br />65,536 Kib <br />8,192 KiB <br />64 Mib <br />0.00781 GiB <br />
RAM1 Size	64 MiB 67,108,864 B <br />524,288 Kib <br />65,536 KiB <br />512 Mib <br />0.0625 GiB <br /> (DDR2)
RAM1 Chip	Winbond W9751G6KB-25
ETH chip1	MediaTek MT7628N
Switch	MediaTek MT7628N
Ethernet Port Count	1-100MbE-WAN; 4-100MbE-LAN
Wired Standard	IEEE 802.3i/3u
	802dot11 OUI: F4:F2:6D (5 E, 5 W), 18:D6:C7 (3 E, 2 W); Ethernet OUI: F4:F2:6D (5 E, 5 W), 18:D6:C7 (3 E, 2 W)
Stock bootloader	U-Boot 1.1.3 Ralink 4.3.0.0
Stock FW OS	Linux 2.6.36
Expansion IF types	none specified
Power	9 VDC, 0.6 A
Connector type	barrel
Serial Port (UART)	yes, 3.3V TTL, (115200 8N1)
Other
	Default SSID: TP-LINK_XXXX (47 addl. devices); Default IP address: 192.168.0.1; the IP 192.168.0.1 is used by 825 additional devices; of which 110 are TP-LINK devices; Default login user: admin; Default login password: admin; admin:admin credentials used by 1358 additional devices; of which 283 are TP-LINK devices
3rd Party Firmware Support	LEDE Project (obsolete, OpenWrt) • (List); , OpenWrt • (List \| Dev \| DLs);
Retail
Availability	End of Life
FCC approval date	01 December 2016
Country of manuf	China
Radio 1
Chip1	MediaTek MT7628N
Wireless interface OUI	F4:F2:6D, 18:D6:C7
Antenna Connector Type	none specified
MIMO status	2x2:2
Wireless Standard	IEEE 802.11b/g/n
802.11n	up to 300 Mbps
802.11g	up to 54 Mbps
802.11b	up to 11 Mbps
WiFi Operating Frequency	2.4 GHz
TP-LINK TL-WR841N v13.x	TE7WR841NV13

For a list of all currently documented MediaTek chipsets with specifications, see MediaTek.

For a list of all currently documented TP-LINK devices with specifications, see TP-LINK.

• 300 Mbps - 2SS 2.4GHz 802.11n (40MHz chan.) = N300 class

Overview

"2050500850" and "1642" is silkscreened on the board in the FCC photos.

Links of Interest

Forum threads

OpenWrt on TL-WR841N v13 or TL-WR840N v4 on OpenWrt forums

Note: TL-WR840N v4 have 5 leds: power, wifi, lan (one led for all ports), wan, lock(wps).

TL-WR841N v13 have 8 leds: power, wifi, lan4, lan3, lan2, lan1, wan, lock(wps).

ramips: add initial support for TP-LINK TL-WR840N v4

Specification:

- SoC: MediaTek MT7628NN (580MHz)

- RAM: 64 MiB (Winbond W9751G6JB-25)

- Flash: 8 MiB (GigaDevice GD25Q64CSIG)

- LAN: 4x 100M

- WAN: 1x 100M

- Antennas: 2x non-detachable

- LED: 5x green

- Buttons: 1x reset

Support for TL-WR840N (ES) Ver 5.0 (EU) on LEDE forums

TP-LINK TL-WR840N v4

CPU: MediaTek MT7628NN @575MHz

Flash: GigaDevice GD25Q64B (8MB)

RAM: Winbond W9751G6KB-25 (64MB)

TP-LINK TL-WR840N v5

CPU: MediaTek MT7628NN @575MHz

Flash: GigaDevice GD25Q32B (4MB)

RAM: ESMT M14D5121632A (64MB)

TP-LINK TL-WR840N v4 on 4pda forums (RU)

Flashing

NOTE: During configuration or flashing a device, the only things that should be hooked to the device is the computer and power.

Flashing OpenWrt

This device is NOT RECOMMENDED for future use with OpenWrt due to low flash/ram.

DO NOT BUY DEVICES WITH 8MB FLASH / 64MB RAM if you intend to flash an up-to-date and secure OpenWrt version onto it! See 8/64 warning for details.

This device does not have sufficient resources (flash and/or RAM) to provide secure and reliable operation.

This means that you will not be able to install many packages, and that you might experience crashes due to OOM situations more or less often. See OpenWrt on 8/64 devices what you can do now.

On the OpenWrt ToH (techdata entry)
On the OpenWrt Wiki

Target: ramips
Subtarget: mt76x8
Package architecture: mipsel_24kc
Supported Since Commit
Support started version: 18.06.0
Current supported version: 25.12.2

LAN Hardware: MediaTek MT7628N
WLAN Hardware: MediaTek MT7628N
WLAN Comment: 2T2R 2.4 GHz
Installation method(s):
U-Boot TFTP recovery, see git-commit
Recovery method(s):
U-Boot TFTP recovery

git • >>

ramips: add support for TP-Link TL-WR840N v4 and TL-WR841N v13
TP-Link TL-WR840N v4 and TL-WR841N v13 are simple N300 routers with
5-port FE switch and non-detachable antennas. Both are very similar
and are based on MediaTek MT7628NN (aka MT7628N) WiSoC.

The difference between these two models is in number of available
LEDs, buttons and power input switch.

This work is partially based on GitHub PR#974.

Specification:

- MT7628N/N (580 MHz)
- 64 MB of RAM (DDR2)
- 8 MB of FLASH
- 2T2R 2.4 GHz
- 5x 10/100 Mbps Ethernet
- 2x external, non-detachable antennas
- UART (J1) header on PCB (115200 8n1)
- TL-WR840N v4: 5x LED (GPIO-controlled), 1x button
- TL-WR841N v13: 8x LED (GPIO-controlled*), 2x button, power input
  switch

* WAN LED in TL-WR841N v13 is a dual-color, dual-leads type which isn't
  (fully) supported by gpio-leds driver. This type of LED requires both
  GPIOs state change at the same time to select color or turn it off.
  For now, we support/use only the green part of the LED.

Factory image notes:

These devices use version 3 of TP-Link header, fortunately without RSA
signature (at least in case of devices sold in Europe). The difference
lays in the requirement for a non-zero value in "Additional Hardware
Version" field. Ideally, it should match the value stored in vendor
firmware header on device ("0x4"/"0x13" for these devices) but it seems
that anything other than "0" is correct.

We are able to prepare factory firwmare file which is accepted and
(almost) correctly flashed from the vendor GUI. As it turned out, it
accepts files without U-Boot image with second header at the beginning
but due to some kind of bug in upgrade routine, flashed image gets
corrupted before it's written to flash.

Tests showed that the GUI upgrade routine copies value of "Additional
Hardware Version" from existing firmware into offset "0x2023c" in
provided file, _before_ storing it in flash. In case of vendor firmware
upgrade files (which all include U-Boot image and two headers), this
offset points to the matching field in kernel+rootfs firmware part
header. Unfortunately, in case of LEDE factory image file which contains
only one header, it points to the offset "0x2023c" in kernel image. This
leads to a corrupted kernel and ends up with a "soft-bricked" device.

The good news is that U-Boot in these devices contains well known tftp
recovery mode, which can be triggered with "reset" button. What's more,
in comparison to some of older MediaTek based TP-Link devices, this
recovery mode doesn't write whole file at offset "0x0" in flash, without
verifying provided file in advance. In case of recovery mode in these
devices, first "0x20000" bytes are always skipped and "0x7a0000" bytes
from rest of the file are stored in flash at offset "0x20000".

Flash instruction:

Until (if at all) TP-Link fixes described problem, the only way to flash
LEDE image in these devices is to use tftp recovery mode in U-Boot:

1. Configure PC with static IP 192.168.0.66/24 and tftp server.
2. Rename "lede-ramips-mt7628-tl-wr84...-squashfs-tftp-recovery.bin"
   to "tp_recovery.bin" and place it in tftp server directory.
3. Connect PC with one of LAN ports, press the reset button, power up
   the router and keep button pressed for around 6-7 seconds, until
   device starts downloading the file.
4. Router will download file from server, write it to flash and reboot.

To access U-Boot CLI, keep pressed "4" key during boot.

TP-LINK TL-WR840N v4

Overview

Links of Interest

Forum threads

Flashing

Flashing OpenWrt

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