Immediately after installing iOS 26 on my iPhone 14 Pro, my phone display stopped working. It's not responding to touch, but I can see it charging. It also wakes the screen whenever I pick it up, but it's not touching at all. What do I do, or do I have to downgrade?
Have you raised a Feedback report? If not, please do so at https://feedbackassistant.apple.com/ then post the FB number here.
Then, if the phone isn't working, yes, you should downgrade.
If the downgrade is successful - and you can use the iPhone as normal - you could try to upgrade again, but if it does the same I'd say hold off until a later beta comes out.
But, it's important that you raise the bug.