WARNING!
Changing firmware in the phone will erase all of your data.
All described operations you are doing at your own risk.
If want saves your data do a backup before start.
Battery must be at least 60% if not you will kill phone completely.
1. First of all, we need to find out exact phone model that we've got.
also, you can find it in phone menu as shown below
2. Turn on FlashTool(depend on windows system 32/64bit use file Flashtool or Flashtool64)
3. Go to XperiFirm,
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4. Select phone model,
5. Now choose exact model from step No. 1.
6. Select firmware by country that you need
(unbranded firmware you can recognize by name CUSTOMIZED_CE1 or CUSTOMIZED_SG they come with all language packages from around the world)
7. Download firmware by pressing firmware version button.
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8. After download is finished close XperiaFirm, now FlashTool will ask you if you want to add downloaded firmware to database just click YES button to confirm.
9. Next press lightning button, 
10. Select Flashmode and confirm with OK button.
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11. Select phone model and model number of your phone, firmware customization and firmware version the one you've downloaded in step No. 7.
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12. Next check userdata, cust-reset everything else must be unchecked.
13. When you're ready press Flash button.
14. Connect turned off the phone to USB cable with pressed volume down button.
15. Release volume down button when you see "Device connected in flash mode" information in FlashTool windows log.The flash process starts, now just wait until process end.
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16. After all disconnect phone from the USB cable. Turn it on with the power button and leave it on a flat surface until phone turns on completely
(this is very important otherwise the phone will not complete the first start and you will see an error message on the phone screen).
17. Congratulations your flash process ended successfully. Now you can enjoy a phone with new firmware.
By Wojtek Góralczyk on Nov 23, 2017
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