Tl-wr740n V4 Firmware

[Marilu Mandez]

Someofficial firmware of TP-Link products can be replaced by the third party firmware such as DD-WRT. TP-Link is not obligated to provide any maintenance or support for it, and does not guarantee the performance and stability of third party firmware. Damage to the product as a result of using third party firmware will void the product's warranty.

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After a long time of successful compilation I tried to find my firmware file in /openwrt/bin/targets/ath79/tiny/ but they are not there. There are other files there but neither factory.bin nor update.bin. I read in the build guide that:

If running make does not yield images for one (or even all) of the boards linked to the device profile that you have selected, than you probably have selected/enabled too many options or packages, and the image was too big to be flashed onto your device.

I have build the images but they don't work. Router turns on and then restarts after sometime and keeps doing that. Maybe the 64MB is too low for that. I will start on an 8MB target next that many help the RAM cope better and I will have some space for additional packages afterwards. Do you have any suggestions?

as you could see, ART was on the end of flash

now, you make some 15M flash image and flashed without moving ART

it is a big chance that you already overwrite/destroyed ART partition and your device will not work

I have already saved the ART partition so even if I wrote over it , I can flash it again. Overwriting ART partition doesn't stop router from booting and getting into LUCI. My problem is that I cannot even get the router to boot into LUCI. It just keeps restarting.

Last problem is the orientation of my LAN ports. As I have a domestic Chinese router, which has small differences from the EU model, the bootloader has marked the WAN port as LAN4 and LAN1 port as WAN. I mentioned it in detail here:

-link-tl-wr740n-v5-china-flash-upgrade-issues/163660/8?u=murabat

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

This means that even setting a password or changing simple network settings might not be possible any more, rendering the device effectively useless. See OpenWrt on 4/32 devices what you can do now.

The serial headers are not completely connected (a voltage divider and capacitor are left out, so the headers are dead), but a serial connection can still be established by soldering directly to two of the empty pads. The result is a bit unstable (router output is often partially lost) and can probably be improved electrically.

The v4.23 uses the standard TP-Link pinout, however the TX pin is not connected to the CPU. In order to make the TX line working, the two points on the bottom side of the PCB must be connected with a small wire. The pin at the SOC is labeled TP18, the one at the serial connector is labeled TP28. The RX line is 5V intolerant! So the connection needs a 3.3V RS232 level shifter. Pins on the connector on the photo are TX-RX-GND-3V3(VCC) (from left to right).

At the original time of writing, no method was known to recover most models from a bad firmware without soldering the serial cable. However, ongoing experiments suggest that TFTP flashing is possible even without soldering a serial port. The list of models and versions which have a factory U-Boot compiled with tftp enabled is to be determined. It's best to try it yourself because there's nothing to lose, but please do share your results at the respective wiki page. For more information, see: -secret-of-tl-wr740n-uncovered.html

Forum member pepe2k made a modification of U-Boot 1.1.4 for Qualcomm Atheros SoCs based devices (the project is still being developed, so new devices and SoCs will be supported in the future). Up to date information, binary images and sources can be found on official GitHub repository.

This modification started from wr703n-uboot-with-web-failsafe project, but supports more devices, all modern web browsers, has a lot of improvements and other modifications (like U-Boot NetConsole, custom commands, overclocking possibilities etc.).

My friend has a tp-link tl-wr740n router. His PC has cable connection and it's ok all the time. Unfortunately, there is a problem with wifi connection. After restarting the router he can connect to the internet with his notebook and 2 smartphones but after several minutes wifi connection stops on all devices (except cable connected PC which is fine all the time). We tried to change wifi channel, mode, and channel width and updated the firmware but it didn't help. I thought that the router is broken but our another friend has exactly the same model. He brought it and we tested it but the result was exactly the same. What could be the problem? Should we provide more information?

After upgrade button click on Open-wrt firmware with factory reset done ,now router dead and When i powered up, all lights are on and off simultaneously after few seconds. I waited about 1 hour but router did not respond any ip address and does not show any connections on Network And Control center Also, I don't know what was the IP address of it.

This exactly happened to me too, when I have flashed factory firmware WITH uboot, which is wrong. Theres no way how to tell if the firmware contains uboot, except it's a bit bigger. You should have used the first released firmware, that contains no uboot I think.

This router does not have firmware recovery via tftp, so you will have to replace it, if its still in the warranty, or open the case, solder serial and recover via nokia ca42 serial cable. How to do this is in the wiki -link/tl-wr740n - see debricking.

Dear nozombian,

MY Router version 4.23 is not in warranty for now....so i want to open and case and solder serial port and recover using nokia c-42 or Dku 5 seeing this wiki link but all pictures of version 4.23 is not so clear to soldier on which port....so i need full details to recover my router..but i am not getting any useful tips to recover my router from EXPERTS too....

so i am so disappointed ...

Dear Bushrod,

I opened router case and found exactly like that on ver 4.23 pictures but picture is not so clear to be soldered ..i am sure i will fry my router if i solder any wrong wires...

i want to try with Nokia C-42 or Dku 5 cable but can't find proper guidance ,,,,please guide me..

Dear nozombian,

Thanks for useful links that i am searching for.....very thankful

Now can i connect any usb cable or Iphone data cable or

i have to use Nokia DKU-5 cable only for 3.3 v?

please guide me in simple steps because i am newbie to these steps...

I have tested only with ca 42 cable, but you can use dku 5 as well I think, for my wr741nd it is allowed to use both, wr740n and wr741nd routers are almost the same. If you have to buy one, get ca 42, if you have by hand dku 5, try it About iphone cable I have no info, but you might try google, if you have it by hand.

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