Hi I’m trying to update my iPhone 8 to my Apple Watch. But it says I have to do an update

The support article you came here from should provide you with the steps needed to try to update your iPhone. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the

"Get Support" link in the upper right-hand side of this forum's web page.