Hlo im from pakistan there is no apple service Center i replaced iphone 11 pro max panel from local market how can i fix the non genuine display message

You are not going to be able to control the "non genuine display" message. What will happen is the following:

You will see a notification on your Lock screen for the first 4 days that you use your device and in the Settings app for 15 days. After that period, you can find the notification by going to Settings ➡️ General ➡️ About

Axel F.

You can’t.