How to factory reset Buffalo WHR-1166D router – Default Login & Password

The Buffalo WHR-1166D router has Gigabit WiFi, 4 100mbps ETH-ports and 0 USB-ports.
It is also known as the Buffalo Buffalo AirStation AC1200 DualBand Wireless Router.
How to factory reset Buffalo WHR-1166D - Default Login & Password

Buffalo WHR-1166D default Password , Login & Gateway settings :

If you have performed a reset of your WHR-1166D device or not changed the defaults, you
be able to access it with the following settings
Default Network name (SSID): Buffalo-A-XXXX,Buffalo-G-XXXX
Default subnet mask:

How to factory reset (hard reset) Buffalo WHR-1166D :

You can factory reset your Buffalo WHR-1166D in the following way(s)
1. When the router is on, press the button reset and hold for 30 seconds.
2. While holding down the button reset, turn off the power of the router and hold down the button reset for 30 seconds
3. While holding down the button reset, turn on the power to the unit again and hold for another 30 seconds

Buffalo WHR-1166D router specifications :

System specs
CPU: 580 MHz
RAM: 128 MiB
Flash: 16 MiB
Custom firmwares: None
WiFi: Gigabit (abgn+ac)
WiFi bands
2.4GHz & 5GHz
WiFi throughput: n/a
1 x 100mbps port
4 x 100mbps ports
USB-ports: 0