Why does the iqoo lock screen not light up when receiving the verification code?

Hand does not set prompts.

Vivo phone has a black screen prompt message and no response. Generally, if there is no response in this situation, there should be a system problem. I personally recommend that you just flash the phone. You can flash the phone yourself, press the power button and the sound button at the same time. Its system upgrade will appear in 30 seconds, and the other step is to clear the data, clear the data cable, and directly click on the first upgrade system. After the upgrade is completed, it should be displayed.