Stock ROM Download: Keeping your devices updated with the latest firmware is very important. On top of that, flashing a Stock ROM solves many problems and it can even unbrick the device if it is damaged for any reason. With XperiFirm Tool, you can flash your Sony Xperia devices easily and safely. What you all need is a PC or Laptop configured with Windows OS. However, if your PC is Windows Vista/7, you might need the .NET framework installed. For Windows 8/10, you will get the .NET framework installed by default.