Replacing the back glass of an iPhone 11 is a bit different from previous models like the iPhone 8 Plus, X, XR, XS, or XS Max. The iPhone 11's back is made of glass, but it is integrated with the phone's frame and other components. Unlike older models where you could simply remove the back glass, the iPhone 11's back is more difficult to replace due to its construction.

If the back glass of your iPhone 11 is cracked or damaged, it is generally recommended to take it to an authorized Apple service center or a professional repair service. Apple offers an official "iPhone back glass replacement" service for the iPhone 11, and they have the expertise and specialized equipment to perform the repair properly.

Attempting to replace the back glass yourself can be very challenging and may lead to further damage if not done correctly. The risk of damaging internal components, disrupting waterproofing seals, and voiding the warranty is significant.

So, to ensure a proper and safe repair, it's best to reach out to Apple or an authorized repair service to have your iPhone 11 back glass replaced professionally.