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How to convert ftf for setool
Creating the actual FTF file: Flashtool is then required to convert the firmware files into the FTF file.Case A is when there is a new update, and Case B is when there isn't. Downloading the firmware: This step requires a locked bootloader, and Apollo89 has detailed two cases which may apply to you.
Changing your device's customization number: An optional initial step, this allows you to download the firmware of another Xperia device with a few simple changes of the build.prop, hence requiring root access.