Last modified 2 years ago Last modified on 06/15/16 17:01:08

How to find the hardware version on a TP-Link device?

Restoring to original firmware

The router can be restored back to original firmware by manually flashing original firmware.


  • visit TP-LINK download website
  • find your router (TL-WR740N_V4)
  • select version of your router's hardware from dropdown meni
  • download .zip of latest firmware of your router
  • prepare firmware
  • upload firmware on router
  • connect to the router through ssh
  • change directory to /tmp
  • flash firmware

Preparing firmware

Once you download right firmware zip and unziped,

you may see word "boot" in firmware binary name (wr740nv4_en_3_17_0_up_boot(150105).bin).

This have bootloader and we need to remove it:

cd /dir/with/boot-firmware/
cp wr740nv4_en_3_17_0_up_boot(150105).bin firmware-boot.bin
dd if=firmware-boot.bin of=firmware.bin skip=257 bs=512

Uploading firmware

if you have modified firmware (from boot version) or if there is just .zip, or if you can't do:

cd /tmp

we need to download to computer and upload it in router

for GNU/Linux do:

scp firmware.bin root@10.<routerIP>:/tmp/fw.bin

this will ask you for router password from nodewatcher

At this point you are connected on router via ssh. Now move to /tmp directory and flash firmware it:

cd /tmp
mtd -r write fw.bin firmware

Restoring default setting

Restoring settings that came with the firmware image:

Restoring bricked router

If you brick router while flashing firmware, you will need to open your tp-link router (TL-WR741ND)

Serial connection

The router can be connected to the computer serial cable using a serial cable.

Connection can be established with the following settings on GNU/Linux or OS X:

cu --parity=none -s 115200 -l /dev/(your serial device)

In case of issue, try

sudo chmod 777 /dev/(your serial device)


Before soldering try

The router can be upgraded/fixed with a TFTP method, although its use should be avoided if possible. A working serial cable is required.


  • prepare your tftp tools
  • get firmware from nodewatcher
  • connect to the serial interface
  • expect Autobooting in 1 seconds write tpl within a second
  • set ip of the router and computer (has to have a static IP)
    setenv ipaddr
    setenv serverip

start tftp server on your computer and include the desired firmware in its path

run the following commands

ar7240> tftpboot 0x80000000 yourRightTPlinkFirmware.bin
ar7240> erase 0x9f020000 +0x3c0000
ar7240> cp.b 0x80000000 0x9f020000 0x3c0000
ar7240> bootm 0x9f020000

router will reboot and start with the new firmware