Good afternoon. I have forgotten my password on my old Sony Xperia Z3. There is no way to reenter with my Google account for this model. Sony support haven't had a possibility to help me, neither do Google support. Now I am desperately trying to do factory reset with volume and switch on/off buttons following numerous instructions on the Internet. But no combination of buttons can allow me to enter the reboot mode and choose the necessary option. Please advise me with this problem. I am willing to erase my old data, as I copied it before, and I would like to continue using my phone.