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if this doesn't work then use PCC to factory reset the phone
Bridge (for Mac)
Alternatives on How to backup Xperias
or you can try to enter the password wrongly for several attempts then the device will ask you to unlock using your google account, make sure you are connected to network/wifi while doing this.
@nolramlb I'm afraid that isn't available anymore. The options has been removed with 5.0.
oh yeah i tried it, it just indicates how many times i entered wrongly. this is sad