IOS Development With XCode And Lower OS Version My IphoneSE1

I tried to launch IOS dev on the iPhone, the phone OS version is 14, lower than the APP, what was needed was lower the app project version just by clicking the app project file in the project files explorer, in the deployment target version dropdown, choose 14. And also connect to the APP dev team by inputting apple Id; on phone, in general, trusted devices, find the device and select trust for the phone to successfully connect to the machine, since my Mac is air 2017, seems USBD service will cause intermittent connection issues, so, in console, use sudo killall -STOP -C usbd to kill usbd service every time phone get connected, then choose iPhone SE for build and run app.