Unroot A Sony Xperia And Return To Stock Firmware

With the release of the Xperia Z in 2013, Sony gained a lot of respect. The latest of this flagship series is the Xperia Z3. The line offers a number of devices in low-end, mid-range and high-end budget ranges so it’s easy for users to find the right device for their needs and price range.

Sony is pretty good at updating their devices, even the old ones, to the latest Android versions. If you’re an Android power user, chances are you’ve not only installed these updates but also rooted your device to unleash Android’s full power.

While experimenting with your device, chances you’re going to ended up soft-bricking it at least once. When this happens the easiest fix is to unroot your device and get rid of root access. You will also need to get your device back to stock condition so you are going to have to flash a stock firmware manually using Sony Flashtool. Sound complicated? Well don’t worry; our guide will take you through it. Just follow along with the steps below to unroot and install stock firmware on a Sony Xperia smartphone.

Prepare you phone:

This guide is only to be used with Sony Xperia smartphones. Check you have the proper device by going to Settings>About Device. Using this with other devices could result in bricking.
Make sure the device has at least 60 percent of its charge. This is to ensure that you don’t run out of battery before the process is completed.
Back up your call logs, SMS Messages, and contacts
Back up any important media files by copying them manually onto a PC or Laptop.
Enable USB debugging. You can do so by either tapping Settings>Developer Options>USB debugging or Settings>About device and tapping the build number 7 times.
Install and set up Sony Flashtool on your device. After installing Sony Flashtool, go to the Flashtool folder. Flashtool>Drivers>Flashtool-drivers.exe. Choose to install the following device drivers from the list presented: Flashtool, Fastboot, Xperia device
Download official Sony Xperia Firmware and then create an FTF file.
Have an OEM data cable to establish a connection between your Xperia device and a PC.

Note: The methods needed to flash custom recoveries, roms and to root your phone can result in bricking your device. Rooting your device will also void the warranty and it will no longer be eligible for free device services from manufacturers or warranty providers. Be responsible and keep these in mind before you decide to proceed on your own responsibility. In case a mishap occurs, we or the device manufacturers should never be held responsible

Unroot And Restore Stock Firmware On Sony Xperia Devices

Download the latest firmware and create a FTF file.
Copy file and paste in Flashtool>Firmwares folder.
Open Flashtool.exe .
You will see a small lightening button located on the top left corner, hit it and then select Flashmode.
Select FTF firmware file that was placed in Firmware folder.
It’s recommended that you choose to wipe data, cache and apps log.
Click OK, and the firmware will be prepared for flashing.
When the firmware is loaded, you will be prompted to attach your phone to the PC. Turn it off and do so. Keep the back key pressed.
For Xperia devices released after 2011, keep the volume down pressed.
When the phone is detected in Flashmode, firmware will start flashing, keep the volume down key pressed until flashing completes.
When you “Flashing ended or Finished Flashing” let go of the volume down key and disconnect the devices. Reboot your phone.