Problem with deleting of software update

To my knowledge, Apple has never supported downgrading.

That said, See this support article:--> If Face ID isn't working on your iPhone or iPad Pro – Apple Support

and/or this one:--> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

If the issue persists, contact Apple Support directly, using this link:--> https://getsupport.apple.com/?caller=kbase&SG=SG003&category_id=SC0999&symptom_id=23303 , or make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector. After checking it out, they'll give you all the available options.

Regards

Giulio

"Delete software update" won't appear if the update process was successful.

Could you please better explain your problem?

You are welcome