How to fix yellow screen and frozen iPhone 13 Pro Max after iOS 16 to iOS 18 update?

AumGaneshaAumMurugaAum dear Sir Madam. I have been using Apple products for 28 years. Need my iPhone working urgently please. It was on iOS 16 then after an update to ios18 suddenly my iPhone 13 Pro Max shows a yellow screen with lines. I have done reset and connected to my MacBook Pro to try update again to solve this challenge; however the update button is not lighted and it’s hidden and only shows restore button. I need to save my data. Please Sir Madam can you give me some advice that will solve this urgently. Cannot believe the timing of this happening to my iPhone! How to solve this today please ? 1stMay2026 yours sincerely Dr Narayana

[Edited by Moderator]

Original Title: iPhone 13 Pro Max after software update from iOS 16 to iOS 18 the screen becomes yellow and frozen! 2026 how to make my iPhone work again please!