Hi! For some stupid reasons, I opened up my reader just then. I thought I didn't do anything risky. Basically just had a look and then put screws back on as how I found them. I was very careful and didn't hear any crack or anything. When I restarted the reader, part of the screen doesn't display anymore (see pic). It still responded to touch though.
It is totally my fault. No argument on that.

But just wonder if there is any way to save it?