Unbricking A TP-LINK TL-WR841N Wireless Wi-Fi Router

This procedure is entirely based on the information obtained from this You-Tube video. I simply needed to refer to the procedure multiple times when experimenting with DD-WRT, OpenWRT, and the stock firmware and it is more efficient for me to follow the written form. The procedure works perfectly for my TL-WR841N V11.x. Please follow Richard Lloyd’s YouTube page for this and other useful information in video format. I didn’t do it; nobody saw me do it; there’s no way you can prove anything!

TL-WR841N_back

  1. Download the version-specific firmware for your TL-WR841N from TP-LINK’s website. My TL-WR841N V11 works well with Firmware Version: 3.16.9 Build 150616 Rel.52099n.
  2. Unzip the downloaded firmware.
  3. Rename the extracted file to wr841nv11_tp_recovery.bin (v11 is used because the hardware (and firmware) is for a Version 11 router).
  4. Download and install the 32-Bit version of Tftpd32 found here.
  5. Disable your wireless card(s).
  6. Connect your PC directly to the router’s port #1 using a network cable.
  7. Assign the following static IP information to your PC’s NIC:
    1. IP address: 192.168.0.66
    2. Subnet mask: 255.255.255.0
    3. Leave all other network settings “as is.”
  8. Launch Tftpd32 and set:
    1. Server interfaces: 192.168.0.66 (via the drop-down selection)
    2. Current Directory: The directory where your renamed firmware from step 3 resides. You can click the “Show Dir” button to confirm that the firmware is visible in the chosen directory.
  9. Hold and continue holding the “WPS/RESET” button for three seconds after using the ON/OFF button to power-cycle the router.
  10. You should see the router grab the firmware update from the TPTP Server status window. The router’s peer address during this process is 192.168.0.86:xxxx.
  11. Close Tftpd32 and wait a minute or two for the router to “settle.”
  12. Change your PC’s NIC from static back to “Obtain an IP address automatically.”
  13. Open 192.168.0.1 in a browser and confirm that the TP-LINK firmware loaded correctly.
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Locating A Samsung SD Card Serial Number

This applies to a Samsung Micro SDXC xGB EVO Memory Card that I recently purchased (and probably a wider range of similar Samsung cards). Despite a long search, I couldn’t find any information (even on Samsung.com) about which of the tiny sets of numbers and letters on the back of the card constituted the serial number.

I’ve finally figured it all out. On the back of the card, there are 4 lines of information. From top to bottom as it relates to the sample image:

sd_back01

Line 1 is the Model Number > MB-MP32D (the 32 signifies 32 GB, in this case)

Line 2 is the Lot ID > MBMPBGVEQBFW-B

Line 3 is the Serial Number > DHTA410GG407

Line 4 is the Country of Manufacture > MADE IN KOREA

 

EDIT: Based on a comment posted by KK, MAY 18, 2017 AT 1:10 PM, I’ve reviewed the product packaging. KK was advised by Samsung Canada Customer Support that the serial number is not on the memory card and is, instead, on the product packaging. I happen to still have the replacement card that Samsung provided under warranty in the original packaging. Unfortunately for this agent at Samsung Canada support, there is no evidence of a serial number anywhere on the outside of the packaging. Upon opening the blister pack, I found no numbers on the inside of the packaging, either.