Router Improved :: Modified to/for Superb Stability and Security

Router:: Tp-Link TL-WR840n-Version 2.0 

I have Done some work on about 28 Routers for Foreign Customers.  I have also done some work for some customers in Bangladesh on these cheap routers.  They Cost around Tk.1600/1700 New in Bangladesh which is roughly about $20.00

This is the Cheapest possible router with decent specification.  It's a 300 Mbps 2.4 Ghz. Wifi router with 1 Wan and 3 or 4 Lan Ports.

But These router design got lots of problems.  They produce a lot of heat especially the SOC becomes hot over 60 C, which makes the router unstable after a few hours of operation.  Also tp link used a crappy firmware that got a lots of bugs and they are disclosed by online community.  Besides It's found that many 7xx/8xx series routers got a backdoor introduced by the product vendor!! To know about he vulnerability of tl-wr840 Please visit this site,
https://www.cvedetails.com/vulnerability-list/vendor_id-11936/Tp-link.html

https://www.cvedetails.com/vulnerability-list/vendor_id-11936/product_id-30820/Tp-link-Tl-wr840n-Firmware.html

Video with vulnerable Tp link router,

https://www.youtube.com/watch?v=7NDrmmZ9b18&t=82s

Also read this interesting vulnerability report for tp-link,
https://threatpost.com/updated-firmware-due-for-serious-tp-link-router-vulnerabilities/123702/

Security warning: unpatched http/tftp backdoor in original firmware: TP-Link TL-WDR4300
http://sekurak.pl/tp-link-httptftp-backdoor/

TP-Link TL-WR840N/TL-WR841N - Authenticaton Bypass
https://www.exploit-db.com/exploits/44781/

TP-Link TL-WR841N/ND V13(All Versions -Mediatek SoC) Cross site request Forgery:
https://exploit.kitploit.com/2018/06/tp-link-tl-wr841n-v13-cross-site.html

All this routers use very cheap Electrolytic capacitors that do not work properly after 6 to 9 months of operation.  Also extra heat causes router to reboot while in load(Workload/normal stress).  There are memory leaks in the firmware that are not properly built, though they used linux os!!

Here are the Hardware Modifications done to the tl-wr840n-v2.

1. Modified to replace 4 Mb flash chip with a 8 mb compatible flash chip.

2. Added heat sink to SOC for Better stability and smooth operation.

3. Replaced with Better Electrolytic Capacitor with low/nominal ESR value.

4. Added Serial UART Riser for easy flash upgrade.

5. Extra : Added External Yagi Quad Antenna for a lot powerful wifi signal.

Modified router TL-WR840n-V2 :: the Motherboard view

Larger and Multiple Heatsink in some routers

Router Programming In action:: TL-WR840n-v2

Software Modification done:
1. Replaced original bootloader with more advanced and easy to use u-boot by pepe2k.
2. Replaced tp-link firmware with Openwrt, Specifically built by me for tl-wr840v2 and v3.

Minicom Serial/UART Interface Booting TL-WR840n Router

Minicom Serial/UART Interface Booting TL-WR841HP Router

After Above modification what User will Experience :

1. Superb Stability will run for days/weeks without errors or reboots.  

2. Wifi Signal will be much stronger with extra Stability.

3. Will have Highest quality ip-table firewall built-in.

4. IPV-6 Inter connection module for future operation in IPV6 System.

There are numerous other features with these routers.  Please visit my Router mod pages for further info and for do it yourself guys.

https://router-mod.blogspot.com/

Please note that doing this kinds of work requires professional training and for Software work, Software engg. degree is prefered!! along with some work experience in any software environment.  For hardware modification a basic hardware work experience in any company and related training required, or else pls. do not blame us or anyone else for bricked routers.