mobiles6.com We help you to hard reset your phone
Here’s the tutorial to solve the problems of your device & To unlock the device when you forgot Pattern,Pin,Password,& Fingerprint.
NOTICE: before you start to hard reset your phone, do the backup of your personal data in your SONY Xperia Z Ultra C6833.
How to Reset SONY Xperia Z Ultra C6833
Download program named flashtool from Sony website:
Then check, that you have installed drivers for your USB data cable.
follow the instructions in your screen, & accept appropriate options.
First you should download PC Companion, in example from here: