Hi and welcome to our forum.

That's downloading mode. It's not fake, but it's not updating either. Downloading mode is used for manually updating/recovering your device using your computer and one of a few different applications.
You can simply remove/replace the battery and then turn it back on. (or in the case of a non removable battery, hold the power button for around 10 second)
You usually end up in this mode by holding a combination of buttons when you turn the device on (generally volume down + power) or by using an app that allows you to reboot into your devices other modes.
What's happening before you end up in downloading mode?