Hi, friend!
When you log in to the B315s-938 WebUI for the first time, you do not have a login password. After you log in to the WebUI, the system prompts you to set a login password.
So the login password you need is the password you set when you log in for the first time.
If you forget the login password, you can reset the device by pressing and holding the power button for 10 seconds to restore the device to its factory settings.When you log in to the device WebUI again, the login password is not required. However, the system prompts you to set the password again.
Because the B315s-938 is a plug-in device, restoring the default settings does not affect the network. The network automatically restores the preconfiguration.
Thanks!