Requirements

To fix the issue, you will need:

• A laptop or desktop computer


• A USB cable

Then:

1. Download Universal Android Debug Tools (ADB) onto the computer


2. Install ADB into C:\Program Files\platform-tools.

ADB is installed and the phone is ready to be fixed. Another SE answer has details on using ADB.

Instructions

A message on Sony's forum (since moved) offered the following solution:

1. Enable Developer Mode
   
   
   
   
   1. Tap Settings > System > About Phone
   
   
   2. Scroll down to Build Number
   
   
   3. Tap Build Number about 7 times
   
   
   4. Confirm Developer Mode, if prompted
   
   


2. Put the Z3C into USB Debug mode
   
   
   
   
   1. Tap Settings > System > Developer Options
   
   
   2. Scroll down to Debugging
   
   
   3. Enable USB Debugging
   
   
   4. Tap OK to confirm, if prompted
   
   


3. Plug the Z3C into the laptop or desktop computer
   
   
   
   
   • ADB must be installed before this step
   
   


4. Connect the Z3C to the computer using the USB cable


5. Confirm the connection, if prompted


6. Open a command prompt


7. Change to the ADB installation directory by typing:
   
   
   
   
   • cd "c:\program files\platform-tools"
   
   


8. Make sure the device is listed by typing:
   
   
   
   
   • adb devices -l
   
   


9. Change the overscan settings by typing:
   
   
   
   
   • adb shell wm overscan 0,0,0,30
   
   

The screen is shifted by about 30 pixels and the navigation buttons now work. It is safe to unplug the USB cable.