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Download Sony flashtool into your computer. Double click on the flashtool.exe file to install. You should see a flashtool folder in C Drive.
Double click on flashtool icon in the folder mentioned in Step 1 to launch flashtool (either is FlashTool or FlashTool64.exe)
For first timer, navigate to C:Flashtooldrivers folder to install “Flashtool-drivers”. Select and check the box of your device model and Flashmode Drivers.
While your device is powered on, connect your device to computer with USB cable. Make sure all drivers are installed properly before start.
Download *.ftf (Be careful to use the correct firmware on different models) and copy to C:flashtoolfirmwares folder in computer.
On the flashtool, click on the lightning icon and click flashmode, then “ok”.
You should see a new windows.
At the right sidebar, check “Data, Cache, Appslog” boxes if you wish to wipe the device before flash. To remain your device data, uncheck all the boxes.
At source folder, browse and choose “*.ftf ” in the flashtool/firmwares. *.ftf.
Press flash button to start flashing.
Follow the prompt instructions.
First, to unplug your device from PC.
Second, power off your device.
Third, enter to Flash Mode on your device by press and hold Volume Down button while connect your device with USB cable to computer.
Forth, connect your device back to computer with USB cable. The screen display will still remain blank in dark.
Monitor the Flashtool in computer. It should continue to run and flash the *.ftf.
Wait until the flash process to complete. You should see “Flashing finished” from the flashtool.
Power on your device and you shall now with new firmware.
Check device firmware to ensure you have properly installed 15.0.A.2.17 firmware – Go to Settings –> About Phone–> Android & Baseband version.
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