The paint on the rear cover peels off when I insert or remove the card tray at an angle

Cause:

If the card tray is tilted when you insert or remove it, the tray will come into contact with the rear cover assembly. In this case, the metal surfaces will rub against each other, causing the paint to peel off.

Solution:

To avoid scratching the surface, it is recommended that you insert the pin vertically when removing the card tray.