https://wccftech.com/xiaomi-mi-8-explorer-editions-transparent-back-found-to-be-fake/

The Mi 8 Explorer Edition was advertised by the Xiaomi as the world’s first smartphone with a clear back that offered you a view of the internals. The concept of a clear phone that shows the internals is a unique one, but the Mi 8 Explorer edition immediately set off alarm bells. Anyone’s who has seen the internals of a smartphone will tell you that they don’t look as neatly organized as they did in the Mi 8 Explorer edition. Xiaomi insisted that the components were ‘real’ and refused to comment further.

Xiaomi wasn’t wrong in that regard, technically. The circuit shown on the back of the phone is in the strictest sense of the word, real. However, it isn’t connected to anything and serves no practical purpose. The components on display in the window are stuck on a small secondary board that mounts in the top section of the phone. Its only job is to sit there and look pretty. It was confirmed all the way back in May by Chengming Alpert, an HTC Forum moderator via the following Tweet