goloprak's solutions

How To Debrick TP Link TL-WN841ND

2014-10-31T15:06:00.001+07:00

I had flashed my router with openwrt, but I want to goback to original firmware. Unfortunately, when I am flashing my router the leds start to blinking. I have a little confuse. But I did this steps til my router goback alive. Please read this carefully.

WARNING: Do It Your Own Risk!

Serial Cable:

Getting serial is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector).
If you do not have serial port on your PC, use Nokia CA-42 data USB cable.

Yet Another user notes:

For TP-LINK WR841ND V7.2 power conector (+5V) is ignored, just connect RX - TX - GND and router power cord, work fine…
My TP-LINK WR841ND V7.2 has a VCC of +3.3V and like the TL-MR3420 http://wiki.openwrt.org/toh/tp-link/tl-mr3420#serial needed to connect a 10k pullup resistor between the TX and the 3.3V pin to get reliable serial:

My TP-Link WR841ND V7.1 also requires the 10k pullup resistor between TX and the 3.3V pin. Without the resistor I just get garbage when I type, but can see some console output.
just swap TX and GND pin in serial and no garbage in serial console, but this is read-only.
For my TP-Link TL841N v9.0 i had to remove R26. It's a pull-up between RX (device side) and VCC. My ftdi device couldn't send data with R26 attached.
For my TP-Link TL-WR841ND v8.4 was not required 10K resistor. My TTL to RS232 converter has bad marking of Tx and Rx pins. So, it was necessary to connect Tx-Tx and Rx-Rx. The connection of Vcc (3.3V) was necessary too. The connection scheme you can find on the following image:

Download an appropriate image to serve from your TFTP server (for example, http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/openwrt-ar71xx-generic-tl-wr841n-v8-squashfs-factory.bin).
Build tftp server (eg. tftpd32.jounin.net)
Hook your routers WAN ethernet port up to your network (for v8.2 it's LAN1 ethernet port)
Connect your Nokia CA-42 data USB cable from computer to serial pins on your router. Power ON your router.

Hook up the serial console as explained in the section "serial console" (I use putty). At the prompt "Autobooting in 1 seconds" type "tpl" quickly to start a uboot console.

Now we need to set router and server IP addresses (here named ROUTERIP and SERVERIP, substitute these with the real IP addresses).

Type in the console:

setenv ipaddr ROUTERIP
setenv serverip SERVERIP
printenv

For example: Configure this static ip for your LAN card 192.168.1.100. If your computer containing other LAN or Wifi card, disable it!

Type in the console

setenv ipaddr 192.168.1.111
setenv serverip 192.168.1.100

192.168.1.111 is the router ip, 192.168.1.100 is the TFTP server ip.

Double check that the output of printenv lists the IP addresses you just set.

Uboot needs the tftp server to be listening on port 69. Make sure your server is configured to listen to that port. Now we can load the firmware over TFTP with "tftpboot 0x80000000 openwrt-ar71xx-generic-tl-wr841n-v8-squashfs-factory.bin":

ar7240> tftpboot 0x80000000

openwrt-ar71xx-generic-tl-wr841n-v8-squashfs

-factory.bin
Using eth0 device
TFTP from server 192.168.1.100;

our IP address is 192.168.1.111
Filename 'openwrt-ar71xx-generic-tl-wr841n

-v8-squashfs-factory.bin'.
Load address: 0x80000000
Loading: checksum bad
################################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
         #######################################
done
Bytes transferred = 3932160 (3c0000 hex)

Note the "3c0000" in the last line (your number may differ). Now execute the following commands, if necessary replacing 3c0000 with the number you got from tftpboot.

Upgrade Firmware to DDWRT: TP-Link WR841ND

2011-06-12T15:12:00.014+07:00

Today our router tp-link TL WR841ND be upgraded to ddwrt, for more rich features such as proxy-- blocking site by url/keyword, site survey, advance wireless setting,etc.

Actually it's very easy and simple, but you must read carefully any informations from tplink, ddwrt forum, and any sources to avoid bricking your router.

Upgrade Firmware TP-Link WR841ND

2011-06-12T14:26:00.017+07:00

It's simple to upgrade your TP-Link WR841ND to newer firmware with additional features. Please follow these steps carefully.

PuppyLinux: Tiny but Powerful

2011-05-23T20:33:00.004+07:00

(credit: puppylinux.org)

This is my favorite distro linux tiny but powerful: PuppyLinux. Today is on 8th on distrowatch. You can do almost anything in PuppyLinux. Puppy Linux enables you to save money while doing more work, even allowing you to do magic by recovering data from destroyed PCs or by removing malware from Windows.

Resize Partition under Linux

2011-05-22T16:41:00.005+07:00

While netbooks with pre-install OS (win OS) first turned on, immediately place the OS installation process. We can not directly determine the extent of partition systems and data, let alone determine the number of hard disk partition (usually 50% of the system partition, 50% of data.

SiSoftware Sandra Lite: Free Computer Benchmarking

2011-05-22T13:57:00.006+07:00

(Credit: sisoftware)

Price engine invaluable?
Why? The Price engine enhances the user's experience by providing product pictures and additional specifications - as well as the the latest price. It enables the calculation of important metrics like Performance vs. Price and Capacity vs. Price (for storage media) which are extremely useful when making comparisons. All this is done automatically rather than manually searching for pricing in stores.

Photorec Data Recovery for Win

2011-05-22T09:02:00.005+07:00

(Credit: cgsecurity)

PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from hard disks, CD-ROMs, and lost pictures (thus the Photo Recovery name) from digital camera memory.

How to Fix 6 Things That Block Your Wi-Fi

2011-05-21T09:07:00.004+07:00

(credit: wi-fi.org)

Does your wireless network seem slow? A recent study by Epitiro, a UK-based broadband-analysis firm, shows that consumers lose an average of 30 percent of the data speed their broadband connection supplies when they use Wi-Fi connections in the home.

Lose an Average of 30% of Download Speed Using Home Wifi

2011-05-20T19:17:00.002+07:00

(Credit: TP-Link WR841N)

Epitiro research reveals that consumers lose an average of 30% of download speed and face an increase in latency of 10-20% when using Wi-Fi connections in the home. Consumers may find on-line game play, VoIP telephony and video streaming unsatisfactory when using Wi-Fi while downloading large files such as MP3s, videos and programs will take longer.

Zentyal : Network Administration

2011-05-20T19:00:00.003+07:00

(credit: zentyal)

Zentyal (formerly eBox Platform) is a unified network server that offers easy and efficient computer network administration for small and medium-size businesses. It can act as a gateway, an infrastructure manager, a unified threat manager, an office server, a unified communication server or a combination of them.

Ten Tips for Public Wi-Fi Hotspot Security

2011-05-20T09:46:00.002+07:00

1. Pick Securest Network
Althouh many hotspots have no security set, some do. If you have a choice, select those that use some form of encryption. You can tell which networks are secured in Windows 7 by left-clicking on the wireless network connections icon, pictured here. Hovering the mouse over each SSID will display the security type.

Rooting Your Android

2011-05-20T09:22:00.004+07:00

(credit: android)

WARNING: Rooting--adding superuser capabilities to your phone by altering its system permissions---is an advanced technique that the inexperienced or faint of heart should

MIFI: Before You Spend Out A Lot Of Money

2011-05-19T20:54:00.008+07:00

(credit: novatelwireless)

MiFi is a line of compact wireless routers produced by Novatel Wireless that act as mobile Wi-Fi hotspots. The MiFi can be connected to a mobile phone (cellular) carrier and provide internet access for up to 5 devices.

How to Hard Reset TP-LINK Products to Factory Default Settings (Wireless Router)

2011-05-14T12:39:00.006+07:00

Suitable for: 300Mbps Wireless N Router,150Mbps Wireless N Router, 54Mbps Wireless G Router

Note: A hard reset will remove all your settings, and your device will be restored to factory default settings. Do not perform a hard reset unless you have backed up your settings or you can do the configuration again.

Restoring Firmware WRT54GL from TomatoRAF

2011-05-12T22:30:00.004+07:00

flashing
to new look

For some reason, WRT54GL's TomatoRaf, I returned to the original firmware. Its web interface of new firmware have a little different from when its first look two years ago.

Firmware upgrade (I said "downgrade"), is very easy, but be careful not to interrupt the router or do not "close the browser". You can see simplified step by step here:

Recover Deleted Files with PhotoRec

2011-05-06T23:12:00.014+07:00

You can try PartedMagic LiveCD to recover the files (doc, docx, xls, xlsx, ppt, pptx, jpg, jpeg, etc.) that have been accidentally deleted or on-delete in the media hard drive / external, usb flash disk (UFD), cdrw, dvdrw, MMC, SD Card, etc. Despite displays text only, but his ability is very powerful.

Recover Lost Partitions With TestDisk

2011-05-06T22:25:00.013+07:00

First always use Partition Magic under Windows XP, but now I used to manage hard drive using GParted (in PartedMagic or PuppyLinux - Thanks so much for Barry Kauler: "I have not found any other linux distro very mini, very useful, up to date , and directly barking, besides PuppyLinux ") to partition the new hard drive, resize partition that is narrow, and backup/copy partitions.

Hard Drive SATA Setting Jumperless

2011-05-05T14:59:00.011+07:00

If you buy a new hard drive desktop (SATA-III, 6GB/s) or notebook/netbook SATA-II (3GB/s) (eg 320 GB) and has put it into computer, the default setting is SATA-I or SATA-II. You can change SATA setting to apropriate setting depending your computer spesifications, with Feature-Tools (F-Tool) from Hitachi.

Harddisk Notebook/Netbook Cloning

2011-05-05T14:26:00.008+07:00

If the hard drive notebook/netbook you're already full of data, and want to replace the hard drive is more relieved without the help of others and without reinstalling the operating system (eg Windows XP) and all drivers, read the following tips:
1. Check the type of hard drive by going into bios (press F2, F10 or del), IDE or SATA and buy the appropriate (for now quite economical SATA hard drive if I buy a 320GB-500GB)

Lightning Arrester: Save Your Networking Devices

2011-05-04T21:23:00.008+07:00

Today, my friend took 3 pieces networking devices: 2 pcs TP-Link modem router ADSL, 1 pcs Dlink switch. He said that networking devices burnt, got lightning.

LCD Monitor

2011-05-03T12:42:00.007+07:00

If you have bought LCD/LED monitor, please running at least 1-2 days nonstop. If any trouble with the monitor please send it to dealer immediately, within warranty period. Some troubles are flicker, dead pixel, unusual color, and etc.

TP LINK TL WR841ND AP+ROUTER

2011-05-02T09:16:00.006+07:00

This is access point + router TP-Link TL WR841ND . There is power ON/OFF button in back side. 1 WAN port, 4 LAN port. Web interface so simple. Default IP setting 192.168.1.1, with username and password: admin.

TP-Link TL-WN350GD WLAN PCI Adapter on Ubuntu 10.04

2011-05-02T08:45:00.007+07:00

Here it is, wlan adapters that can be directly detected by Ubuntu 10.04.

The first in order for students to recognize other types of WLAN adapters we decided to buy TL-WN350GD three units.

Cheap less around $10/pcs. About durabilty: just wait ...

WLAN Adapter PCI DLink DWA 525 on Ubuntu 10.04

2011-05-02T07:26:00.015+07:00

Last few months ago we purchased this adapter DLink DWA 525, 7 pieces with a higher price than TP Link, to test students' competence. We hope that with a higher price, it can be high quality and easily to be installed but unfortunately an adapter can not be directly detected properly by Ubuntu 10.04 (LTS). Finally it could be installed properly after visiting the ubuntu forums.

Bandwidth Limiter WRT54GL with TomatoRAF

2011-04-14T10:12:00.029+07:00

It's so easy to make your AP+Router WRT54GL (default firmware linksys) as bandwidth limiter, you can try firmware TomatoRAF (tomato victek, wikipedia, based on Tomato standard). So don't be affraid you brick your router as long as you follow the right instructions.