This bash script reboots TP-Link routers

TP-Link_TD-W8960N_Reboot.sh

#!/bin/bash

# This software comes without any kind of warranty or license, use it at your own risk.
#
# Author: Andrea Galloni
# E-mail: andreagalloni92[at]gmail{dot}com
#
# Works on TP-Link 300M Wireless N ADSL2+ Modem Router TD-W8960N
# Firmware Version: 1.3.6 Build 100825 Rel.68770n
#

# Parameters setup
username='username'
password='password'
uri_containing_sessionKey='192.168.1.1/resetrouter.html'
baseURI='192.168.1.1/rebootinfo.cgi?'

# takes the sessionKey from the router rebooting web page (192.168.1.1/resetrouter.html)
sessionKey=$(curl -ks --user $username:$password $uri_containing_sessionKey | awk '/sessionKey/{ print substr($3,2,20);exit}')

echo $sessionKey
echo 'REBOOTING'
# performs the get request to reboot the router and flush away the output
curl -ks --user $username:$password $baseURI$sessionKey > /dev/null
echo 'REBOOTED'

@Prime-Nobel have you tried using @pablen solution?
PLEASE Lemmie know which was the issue if solved! (maybe it was a credential issue?)

p.s.: I don't have this router anymore, thus I can't test. :S