If you are developing an android app for your mobile phone and you connect the Galaxy Ace 4 to your computer it might give you an error. The most common error is that the USB driver cannot be found and that SM Bus Controller cannot be found. You will need to download the Galaxy USB driver for this.
The error might be as follows when you install it. It says: “The installation of the driver was not successful”
USB controller | Driver not found
SM bus controller | Driver not found
First you will need to uninstall the USB driver already on your computer as well as the SM bus controller. This means uninstalling the USB root hub on your computer. Then you will need to reboot the computer and install the driver again without the mobile phone connected to the computer. Once installed then only connect the phone via the USB tether.
Download the Samsung USB driver first before you uninstall the driver.