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Just updated my iPhone 11 & iPhone XR to 14.3 and the iPhone 11 screen crashes. I have tried new cables and the same happens on them too. Just to add a quirk to the mix the iPhone XR on 14.3 works perfectly.
I have attached a couple of photos so explain what is happening.
I recall seeing someone on another GLA forum having a similar issue. The suggestion was to turn the phone completely off, wait a minute, then power back on. Good luck!