Download Official Sony Flash Tool for Your Xperia Device
Xperia users use unofficial flash tools that allow them to install firmware packages on their Xperia devices but the bootloader of their phone must be unlocked, this method is similar to Odin that can be used to install firmware on Samsung devices. But unofficial tools might damage your Xperia device, but now you should not be worried about that because Sony has now released the flash tool officially for Xperia smartphones that allow you to install firmware bit more easily.
You can use the official flash tool to install official firmware back on your unlocked Xperia smartphone, however it’s also important to note that currently it doesn’t support all models, however hopefully Sony will add support of more devices soon in near future.
If you’re itching to flash firmware on your Xperia device using the official Sony flash tool, head over to the official Sony developer website to download flash tool.