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I got my 14 pro max today. The pwm was present at 100% brightness as well. Can’t measure the frequency thought..Unfortunately after 15-20 mins with the device, terrible eye fatigue & nasea same like 13 pro max (i returned that last year) . But that is my case so maybe different for others… stuck with iphone 8 plus .. no way out
You can buy an iphone 11. It using IPS screen like your ip8
 
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