Can I download iOS 17 on my iPhone 6?

Here’s Apple’s list of available compatible devices in their realms of devices:

iPhone models compatible with iOS 17 - Apple Support (CA)

iPhone 6? Not supported after iOS 12.

As for iOS 17 on iPhone 6? Nope. Not happening.

The iPhone 6 hardware is too old and too limited.

Okah5994 wrote:

Show me the video of how I will follow change my iOS 12

There is no such video, as it is not possible.