Unable to connect my phone/tablet to a computer via a USB cable

Unable to connect my phone/tablet to a computer via a USB cable

1 Check for hardware issues

1. Verify that the USB cable is properly connected.

After your phone/tablet is connected to a computer via a USB cable, a screen, as shown in the following figure, should be displayed.

The following figure shows the screen displayed on a phone/tablet running Magic UI 4.X or later when it is connected to a computer.

It is recommended that you use a standard USB cable for your phone/tablet. A non-standard USB cable may only support charging.

If the preceding screen does not display, troubleshoot the issue by performing the following:

Check whether the USB cable is functioning.
Use a standard USB cable and try again.
Check whether the USB port on the computer is functioning.
Connect your phone/tablet to a computer. If the computer has no response or a message is displayed indicating that an unidentified USB device has been detected, go to Device Manager > Ports and check whether "Android Adapter PCUI" and "DBAdapter Reserved Interface" are displayed in the list.

If they are displayed in the list, the hardware is functioning properly. Go to the Check for software issues section below to proceed with the troubleshooting.

If they are not displayed in the list, perform the following:
1. Connect your phone/tablet to another USB port on the same computer, and see if the preceding two ports are displayed in the list. If so, keep your phone connected to that USB port, and go to the Check for software issues section below to proceed with the troubleshooting.
2. If the preceding two ports are not displayed in the list when your phone/tablet is connected to any of the USB ports on the computer, connect your phone to another computer if possible.
  1. If the two ports are displayed in the list when your phone/tablet is connected to a USB port on that different computer, keep your phone connected to that USB port, and go to the Check for software issues section below to proceed with the troubleshooting.
  2. If the two ports are still not displayed in the list, back up your data and take your phone/tablet and proof of purchase to an authorized Honor Customer Service Center for assistance.
3. If there is no other computer to perform the test, back up your data and take your phone/tablet and proof of purchase to an authorized Honor Customer Service Center for assistance.

2 Check for software issues

Check on your computer to see whether the USB driver for the phone/tablet is functioning.
a. Check whether a USB icon is displayed on the right side of the computer status bar. If a rotating circle is displayed on the USB icon, it means that the driver is being installed.

b. Right-click This PC (My Computer) from the desktop, and go to Manage > Device Manager from the shortcut menu. If the ADB driver does not exist in the list, or there is a question mark or exclamation mark on the driver icon, the driver is not functioning. You need to reinstall the driver.
Check whether the drive letter for your phone/tablet is displayed.
If you can access your phone/tablet as a drive letter on the computer, but no files are displayed, perform the following:
1. Check whether Charge only is displayed on the lower part of the phone/tablet screen or in the notification panel.
2. If Charge only is displayed, switch the USB connection mode to Device file manager (MTP). Then double-click the new drive letter name that corresponds to your phone/tablet.
Check if you are using a third-party phone/tablet assistant.
If the issue occurs when you are using a third-party phone/tablet assistant, perform the following:
1. Open Settings, then search for and access Developer options.
2. If it can't be found, search for and access About phone/tablet in Settings, and touch Build number seven times in a row (enter the lock screen password if required) until the "You are now a developer!" message is displayed. Go back to the Settings screen, search for and access Developer options, and turn on USB debugging.
3. If USB debugging has been enabled, try removing the USB cable and plugging it in again. If the issue persists, disable USB debugging and enable it again.
If the issue still persists, it may be caused by the third-party phone/tablet assistant, which may be incompatible with the Android system. It is recommended that you use HonorSuite to connect to your computer.