I want to update iOS 14.8.1

Apple does not support iOS 14 updates anymore. You will have to update to iOS version 15.3 at this time.

Axel F.

Settings > General > Software Update > [What you see is what you get] here

peterson218 Said:

"I want to update iOS 14.8.1"

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Updating an iOS:

Are you having issues with the currently-installed iOS? Or do you want to update from it?

Update Using a Computer:

Use my User Tip:  Update your iPhone Using a Computer - User Tip