In order to become developer friendly company, Sony has outed new flash tool for its Xperia device. So now it will be safe to official Sony Android firmware on Xperia devices that have an unlocked bootloader. Now you can simply install any custom roms by downloading the program from its dev portal, connecting your device, selecting the available “services” (read: Xperia ROMs), flashing your ROM of choice and then rebooting.
Head Over to Sony Blog for More.