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 Z1 C6903.
How to Reset SONY Xperia Z1 C6903
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: