Smartphone Redmi 4A Android 7. 1. 2 - est-il possible de communiquer avec un ordinateur portable par USB?

Did you set USB on the phone to file transfer mode?

Connect the USB cable to the phone and to the computer, on the phone there should appear an option to choose what you want to use, select file transfer so that the phone is visible on the laptop and you will have access to the things on the phone.

Smartphone Redmi 4A with Android 7.1.2 system should be able to establish communication with the laptop using a USB cable. If your laptop does not detect the smartphone, there are several possible reasons: Check if the USB cable is fully functional, you may try connecting another USB cable. Make sure that the file transfer mode (MTP) is enabled on the smartphone. This can be done by expanding the notification bar and selecting the file transfer option. Try installing the latest USB drivers for your laptop. You can download them from the laptop manufacturer's website. If you are using the Windows operating system, try uninstalling the USB drivers for the smartphone and then reconnecting it so that the system can automatically install the correct drivers. If none of the above steps helped, try connecting the smartphone to another computer to see if the problem occurs only on this specific laptop. I hope the above advice will help in resolving the problem of lack of communication between the Redmi 4A smartphone and the laptop via USB.

Set the phone to file transfer mode using USB there are tutorials on YouTube.