TP-LINK TL-WR720N v2

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bgn (N150)
150Mbps Wireless N Router
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dd-wrt
OpenWrt
Incompatible
Tomato any flavor
Incompatible
Platform
BrandModelRev
TP-LINK TL-WR720N v2.x
FCC ID
Type
wireless router
CPU1
CPU1 Type
MIPS 24K (v7.4)
CPU1 Speed
400 MHz
Flash1 Chip
GigaDevice GD25Q16CSIG
Flash1 Size
2 MiB2,097,152 B <br />16,384 Kib <br />2,048 KiB <br />16 Mib <br />0.00195 GiB <br />
RAM1 Size
16 MiB16,777,216 B <br />131,072 Kib <br />16,384 KiB <br />128 Mib <br />0.0156 GiB <br />
RAM1 Chip
Zentel A3S28D40JTP-50
ETH chip1
Switch
Ethernet Port Count
1-100MbE-WAN
2-100MbE-LAN
Wired Standard
IEEE 802.3i/3u

802dot11 OUI: 18:D6:C7 (3 E, 2 W)
Ethernet OUI: 18:D6:C7 (3 E, 2 W)

Stock FW OS
VxWorks 5.5.1
Expansion IF types
USB 2.0 (solder pads), GPIO
Power
5 VDC, 0.6 A
Connector type
barrel
Serial Port (UART)
yes, 4-pin header, J1, TP18, (115200 8N1)
Other
Manuf/OEM/ODM
Retail
FCC approval date 30 December 2015
EAN 6935364090739
(UPC DB, On eBay)
Country of manuf China
Radio 1
Chip1
Wireless interface OUI
18:D6:C7
Antenna Connector Type
soldered
MIMO status
1x1:1
Wireless Standard
IEEE 802.11b/g/n
802.11n
up to 150 Mbps
802.11g
up to 54 Mbps
802.11b
up to 11 Mbps
WiFi Operating Frequency
2.4 GHz
 CPU1 brandRadio1 chip1 brandRadio1 chip2 brand
TP-LINK TL-WR720NAtherosAtheros
TP-LINK TL-WR720N v2AtherosAtheros

For a list of all currently documented Atheros (QCA) chipsets with specifications, see Atheros.

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

150 Mbps - 1SS 2.4GHz 802.11n (40MHz chan.) = N150 class

Overview

"2050500519", "CA-F120" and "164602002" (11/2016)

is silkscreened on the board.

V2 has external fixed antenna (internal Inverted-F in V1).

Links of Interest

See also TP-LINK TL-WR720N v3.0 (3G) and v4.0 (CN)

(completely different devices under the very same name,
see TP-LINK_TL-WR720N v1 page for more info)

Flashing

Stock firmware

wr720nv2-ru-up.bin bootloader at 0x68d4, kernel at 0x40114

(LZMA 6E 00 00 80 00).

FS signature 4x owowowow, BE32 = 1?, BE32 file count, BE32?,

40 char name, BE32 len and ofs (LZMA 5A 00 00 80 00).

JTAG-Serial Info

Serial

Serial Pinouts

[ TX ] ( RX ) ( GND ) ( 3.3V )

You need to solder a jumper wire between TP18 and TP28 on the back

of the PCB for TX to work.

TX are logs from router to PC (-> RX on PC side), RX commands back

(3.3V to 2.5V resistor divider nearby <- TX).

V1 repair features PCB photos, boot log and unsuccessful flash chip /

firmware upgrade to one of MR3220. • same guy?boot log

Bootloader confusingly indicates only 8 MiB of RAM (pDmaBuf=0x80637910, buffend = 80782514),

while VxWorks kernel later allocates full 16 MiB (pDmaBuf=0x80e1c560, buffend = 80f67164).

VxWorks-based WR702N and WR710N exhibit the same bug.

VxWorks

Tap Enter after the boot log to access VxWorks console. help or ? prints commands available.

Not very useful since almost everything is hardwired, but provides some insight into inner workings.

Full flash backup

Set up PC for fixed IP 192.168.1.100 with TFTP server, wired connection to LAN port is required.

Start terminal at 115200 baud, issue Ctrl+C to stop auto-boot after ~1 s, then
flash read 0 80100000 200000
tftp 192.168.1.100 put full.bin 80100000 200000
  • bootloader and kernel identical to wr720nv2-ru-up.bin without 0x94 bytes header
  • 0x1c0000 - settings (backed up as encrypted config.bin)
  • 0x1e0000 - LAN/Wireless MAC address (6 bytes), 0x1e0010 - WPS PIN (ASCII)
  • 0x1f1000 - calibration area (0x440 bytes), most important part to back up!

Pictures

User Images