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
This will display the wifi settings page. Here you can enter your new wifi name and password and click on Save and Restart