lcd repair and any changis

LIke many Android phones, there are two methods for replacing the screen. The first way is to separate the LCD from the midframe; you have to open up the phone and remove enough parts to access the display connector, then pry the screen from the frame, clean off the old adhesive, and glue a new screen onto the frame. This video shows how to do that repair.

Redmi 9 Prime Screen Display Combo Replacement -- Redmi 9 Prime Mobile Glass Repair -- POCO M2. - YouTube

The second, preferred method is to purchase the screen already mounted on the midframe. The replacement procedure consists of gutting the old phone; i.e., removing all of the internal components and moving them to the new screen+frame assembly. This assures you the screen is securely attached to the frame and will give you more water resistance than a DIY glue job. Of course, if your frame is bent, you definitely want to use this method. Here's a video showing that procedure.

Redmi 9, 9A, 9 Prime Cracked Restoration - Original Screen Replacement - YouTube

The priced difference between a screen alone and a screen+frame assembly is usually minimal, and could easily be made up by the need to purchase glue to resecure the screen.

Good luck, and be sure to let us know how it all turns out!