First, download software C:/Flashtool/Firmwares copy and paste the software into the folder.make sure it has an extension to the ftf. Otherwise, flashtool will not see the software.
Sony Xperia Flash Tool Windows (0.9.23.2) Download
Sony Xperia Flash Tool MAC (0.9.23.2) Download
Sony Xperia Flash Tool Linux (0.9.23.2) Download
Let's run the flashtool application
Click on the flash (lightning icon) button
Select flashmode and say OK
The software in the Firmwares folder will be listed on the left. Select software
Files that will be loaded in the context section are displayed
If you select wipe, the phone is reset to factory settings and the data is deleted.
In the exclude section, you can select the files that you do not want to be installed.
If you install the TA file, your phone may be SIM-lock. You must select this file on each installation and cancel the installation.
Select No final verification in Misc and cancel validation.
If we do this, we can skip to the next step.
Click the flash button to prepare the program for installation
When you see this screen, you will connect the phone.
Hang up the phone and wait 30 seconds.
On 2011 and earlier models, press the back button, and on 2012 and later models, press the volume key and connect the phone with a cable to the computer.
When you see Flashing finished, you're done. Disconnect the cable and turn on the phone