Flashtool?

[3t]

I downloded Global 4.3 update.I'm thinking of flashing it.Can someone Link Flashtool and tell me which Drivers to choose.Is it important to have unlocked bootloader?

[Uliwooly]

http://talk.sonymobile.com/t5/Xperia-Z-ZL-ZR/How-to-manually-update-downgrade-root-2013-Xperias/td-p...

You don't have to unlock the bootloader at all