The industry standard for flashing Xperia devices. You can find the latest version on the official Flashtool website. C6802 FTF Firmware: You will need the specific firmware file for the
FTF (Flashtool Firmware) is a bundled format used by Sony's (by Androxyde). It contains: sony c6802 lock remove ftf
How to Remove Screen Lock on Sony Xperia Z Ultra C6802 Using FTF If you are locked out of your Sony Xperia Z Ultra C6802 The industry standard for flashing Xperia devices