How to get back default index.htm file?

Bolt is unable to connect to wifi after i changed my wifi password.
And it already has another index.htm file uploaded.
How do I get back the original index.htm file so that I can connect bolt to wifi?

As described in the Bolt workshop’s Module2 Section.2.3 , use the second method to setup the Bolt to connect to your new wifi.
The only change you need to this is, after connecting your phone/ laptop to the Bolt’s wifi, open the chrome browser and type 192.168.4.2/settings
This will display the wifi settings page. Here you can enter your new wifi name and password and click on Save and Restart