USB React Native Device Not Found - Shell-Bash

Introduction

If you are working with React Native, you may have encountered the error message "USB React Native device not found" when trying to run your app on an Android device. This error occurs when the computer is unable to find the connected Android device. This guide will provide steps on how to troubleshoot and fix this issue.

Step 1: Check USB connection

The first step is to check if the USB connection between the computer and the Android device is working properly. Follow these steps:

1. Unplug the USB cable from both the computer and the Android device.
2. Reconnect the USB cable to both the computer and the Android device.
3. Make sure that the device is unlocked and that the "Transfer files" option is enabled in the USB settings.

If the USB connection is working properly, move on to the next step.

Step 2: Enable USB Debugging

In order for the computer to communicate with the Android device, USB debugging must be enabled on the device. Here's how to do it:

1. On the Android device, go to "Settings" > "Developer options".
2. If "Developer options" is not visible, go to "About phone" and tap on the "Build number" option multiple times until it says "You are now a developer".
3. In the "Developer options" menu, enable "USB debugging".

If USB debugging was already enabled, move on to the next step.

Step 3: Restart ADB

ADB (Android Debug Bridge) is a command-line tool that allows the computer to communicate with the Android device. Sometimes, restarting ADB can fix the issue. Here's how to do it:

1. Open a terminal window.

2. Run the following command:

   adb kill-server
   

3. Run the following command:

   adb start-server
   

If the issue persists, move on to the next step.

Step 4: Check ADB connection

Sometimes, the computer may not be able to detect the Android device due to a problem with the ADB connection. Here's how to check it:

1. Run the following command in the terminal window:

   adb devices
   

   This command will show a list of devices connected to the computer. If your device is not listed, there may be a problem with the ADB connection.

2. Disconnect the USB cable from the computer and the Android device.

3. Restart both the computer and the Android device.

4. Reconnect the USB cable to both the computer and the Android device.

5. Run the following command in the terminal window:

   adb devices
   

If your device is now listed, try running your React Native app again. If the issue persists, move on to the next step.

Step 5: Update ADB drivers

If none of the above steps have worked, it's possible that the ADB drivers on the computer are outdated or corrupted. Here's how to update them:

1. Go to the Android developer website and download the latest version of ADB for your operating system.

2. Unzip the downloaded file.

3. Open a terminal window and navigate to the directory where you unzipped the file.

4. Run the following command:

   ./adb version
   

   This will confirm that the new ADB is installed and working.

5. Try running your React Native app again.

Conclusion

In this guide, we've gone over the steps to troubleshoot and fix the "USB React Native device not found" issue. By checking the USB connection, enabling USB debugging, restarting ADB, checking the ADB connection, and updating ADB drivers, you can get your React Native app up and running on an Android device.