I have encountered your problem, in fact, Sony Ericsson's mobile phone is like this. Fortunately, I loved OK8 brand protective film last time, and their customer service helped me solve this problem. I will share the customer service answer of OK8 mobile phone protective film with you.

There is no display when the mobile phone is connected to USB, mainly when it is connected, the mobile phone shows what connection mode you have chosen, including mirror mode, big data transmission mode and software installation mode. If you choose the big data transmission mode, you will see a green connection sign in the lower right corner of the computer. At this time, when you refresh your computer, you can see your phone disk.

If it is not displayed, it means that the driver of that mobile phone is not installed in your computer. At this time, just look at your computer's hardware manager. That's the picture I uploaded. You only need to install the driver of that mobile phone once.

If it still doesn't work, you can only say that there is something wrong with your mobile phone and ask for after-sales maintenance.

I hope my answer is helpful, remember to give points. Hahahan