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 Tablet Z WiFi .
How to Reset SONY Xperia Tablet Z WiFi
First you should download PC Companion, in example from here: