====== TP-Link TL-WR842ND v2.1 ======

How to reset (recover) the factory firmware on a TP-Link TL-WR842ND v2.1.
  - Get the firmware and "shorten it"
  - Set a TFTP server on your machine
  - Put the device on failsafe mode and connect to computer static IP: ''192.168.0.66''

All info is taken from [[https://openwrt.org/toh/tp-link/tl-wr842nd|this page on OpenWRT]] and corrected to work with my particular device and setup.

==== 1. Firmware ==== 
  * Download latest firmware from here: https://www.tp-link.com/us/support/download/tl-wr842nd/#Firmware
  * Since it's a "boot" version, you need to "shorten" it (and rename it)

<code=bash>
dd if=wr842ndv2_en_3_16_9_up_boot(150514).bin of=wr842nv2_tp_recovery.bin skip=257 bs=512
</code>

==== 2. TFTP server ====
On Arch:
<code=bash>
pacman -Syu tftp-hpa
</code>

Then move the ''wr842nv2_tp_recovery.bin'' you just created and put it in ''/srv/tftp''.

Start the TFTP server:
<code=bash>
systemctl start tftpd.socket
systemctl start tftpd.service
</code>

==== Failsafe ====
  * Correct a good RJ45 cable from LAN on the device to Ethernet plug on computer configured as static IP: ''192.168.0.66'' 
  * Put device in failsafe mode:
    - Unplug power chord
    - Press and hold reset button
    - Power up the device and keep reset button pressed
    - Wait till the //lock// LED is on
    - Release reset button 

If all goes well, the device should pick up quickly the new firmware and reboot.

--- //[[juego@requiem4tv.com|Julien Deswaef]] 2021/04/17 20:46//