How can I reload 16 and delete 17 upgrade?

No, it is not possible to downgrade the iOS version on an iPhone.

Once you update to a newer version of iOS, Apple stops signing the older versions, which means that it is no longer possible to install them on your device.

This is done for security reasons, as older versions of iOS may contain vulnerabilities that have been fixed in more recent versions.

It is generally recommended to stay up-to-date with the latest version of iOS, as it often includes important security updates and new features.

Apple has never supported downgrading iOS. So, you can't install iOS 16 once you've updated to iOS 17.

Unfortunately, your question incorrectly assumes that you can downgrade from iOS 17 to iOS 16.

You can't.

Certainlyhopethisoneworks wrote:

The 17 update is horrible. I want to revert to 16.

How?

Sorry downgrading isn't supported by Apple.