How do I downgrade from iOS 26 to a previous version on my iPhone 14 Plus?

Hi, you cannot downgrade from iOS 26 to a previous version because Apple has stopped signing older versions, meaning the downgrade channel is closed. Once a device is updated to a new iOS version, it can't be reverted to an older version through official means, and restoring from a backup won't work because backups are version sensitive. Hope this answers your question.

Have you followed these steps? :

If Face ID isn't working on your iPhone or iPad Pro - Apple Support

If you have and that does not resolve the problem, then there might be a hardware problem with your phone that no update will resolve. Take the phone to an authorized service provider for diagnosis and possible solution.

Gsz25 wrote:

Thank you that helps. I only uploaded iOS 26 because the feature to use Face ID has never worked on this phone always the message when I try to set it up that “Face ID is not available at this time “ I hope iOS 26 would fix that . It didn’t, only made the phone worse

You need a new phone.

You can reduce Liquid Glass....

https://www.popsci.com/diy/how-to-tone-down-liquid-glass-iphone/