Sony Xperia - Hard Reset / Password Removal

Step 1 — Xperia Play - Hard Reset / Password Removal  

• Open the Emergency call keyboard.
• Enter this code: *#*#7378423#*#*
• From the Service Menu select: "Customization Settings".

EditStep 2 

• Select "Reset customization" and "Reset customization and reboot".
• The Android system will erase all personal information and will reboot the phone to the original factory settings.

EditStep 3 

• Did you do it successfully?

  
  

  Courtesy from iFixit (https://www.ifixit.com/Guide/Xperia+Play+-+Hard+Reset+-+Password+Removal/30567)