This section describes actions that might damage your device or firmware. Proceed with care!

You have to match the exact AP / WiFi router version to prevent issues!


1. Do not power off the router during the HotspotOS installation, as it can cause the device to crash or become unusable.

2. Some AP models require 10 to 15 minutes to boot after initial installation. Please be patient and wait until the device flashing is finished ( led indicator stop blinking).

3. Do not flash APs over WiFi, use an ethernet cable to connect to the AP.

4. Certain AP models cannot be restored to stock firmware. With such devices proceed at your own risk.

Please select a model and download HotspotOS.




Please reset the AP / WiFi router to factory settings to avoid problems with some previous configuration.

Connect your computer by network cable to Buffalo router port 1.
Please log in to the Buffalo web interface at and login using admin as username and password as the password.

Go to the Administration/Firmware Upgrade section.


Be sure and untick Keep settings option before HotspotOS installation.

Click Browse and navigate to the location where the HotspotOS for your model is downloaded.
Click the Upgrade button.

The HotspotOS installation procedure can take a few minutes.
During this process, you will see information about the processing.

Do not power off the router during the HotspotOS installation, as it can cause the device to crash or become unusable.

Reconnect LAN cable or Disable/Enable NIC card in order to get new valid IP address in 10.200.0.x range from router.

Configuring parameters

Start your browser and in URL field type to login to HotspotOS.

Username: admin
Password: admin

Press the Login button to access to Status tab.

On the HotSpotOS Status page, you can check AP MAC address, Public IP, device Uptime, Radius and Cloud status, and a number of users connected to AP.

The MAC address of your AP will be used in the SignUp process.

During SignUp, after typing HotSpot name, select as HotSpot model HotspotOS, and add your MAC address from the Status tab.

From the Setup page configure your AP.

The Hotspot is started and the Autostart and Inactivity Logout options are active by default.

Inactivity Logout is set to 900 sec. Inactivity period defines how long will the device stay logged-in without activity. This prevents repeated logins if the connection temporarily breaks.

IP-based Authentication is used to switch AP domain ap.wifihotspot.io to
It is recommended to disable this option to avoid issues with https-based websites.

Radius Timeout – 8sec
Auto Update – enabled

Master/Slave mode
One AP will manage access and roaming for all other APs.
Enable only if multiple APs are installed in a location.

By default as Network WAN Connection is set DHCP, but you can choose network protocol based on your needs. Our recommendation is to use DHCP Network Protocol.

WiFi channels – Eleven channels are designated in the 2 GHz range, spaced 5 MHz apart from each other. Those eleven channels in the spectrum are allowed anywhere in the world.

DNS – Custom
IP –

Please note, if the DNS IP address isn’t the whitelist will have no effect.

Save changes.

From the SSID tab, you can Enable SSID 1 and 2.
Configure the SSID name and enable it.
Secondary SSID 2 is mostly used for staff WiFi with WPA2 password but you can also enable Hotspot on it.

If you want to use Social network login feature or Paypal as payment gateway, enable it on the Whitelist tab and Save changes.

You can also whitelist websites based on URL, IP, or MAC.

From the System tab, you can flash HotspotOS image and change the Admin password.

When you finish setup, restart the AP / WiFi router to apply changes.

Buffalo HotspotOS Download

Buffalo BHR-4GRV

Download HotspotOS

Flash Instructions

using factory image:

1. Boot the BHR-4GRV normaly and connect the computer to its LAN port
2. Access to
with user “bufpy” and password “otdpopy”
3. Select the HotspotOS image and click “OK” button to perform
firmware upgrade
4. Wait ~200 seconds to complete flashing

Buffalo BHR-4GRV2

Download HotspotOS

Buffalo WZR-HP-AG300H v1

Download HotspotOS

Buffalo WZR-HP-G301NH v1


Buffalo WZR-HP-G450H v1

Download HotspotOS

Buffalo WXR-2533DHP

Download HotspotOS

Flash Instructions

To persistently write the firmware, flash an openwrt sysupgrade image from inside the initramfs, for example transfer via `scp root@` and flash on the device with `sysupgrade -n /tmp/`. Then wait ~120 seconds to let it finish the flashing process.

Buffalo WBMR-HP-G300H

Download HotspotOS

If you need help with configuration, please go to starthotspot.com and contact our tech support. We’ll be glad to help you.

Updated on April 30, 2024

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