There is a problem with the iPhone “iPhone” that requires it to be updated or restored.

I got this message on my iMac when trying to charge my iPhone. I had wanted to charge my phone when a message came up saying it required an update to my phone. After clicking update, (not restore) my iPhone now shows the lightning cable to a computer with the support.apple.com/iphone/restore on my screen. My phone will not respond to anything. I've tried to shutdown, restart but the same screen reappears. I've tried volume up hold and let go, volume down hold and let go as well. What should I do?