1. SAFE MODE
. – Safe mode allows you to turn on the device with third-party apps disabled. Then you can easily remove all apps that maybe causing a conflict or a software problem.
. – First way to enter Safe mode, pres the power off button. From the Power off menu, tab and hold “Power off” option, until you see “Reboot to safe mode” menu.
. – Second way – turn off the phone. Turn it on and when you see the Xperia logo, press and hold the volume down button until the phone load Safe mode.
. – To get out of the safe mode, simply turn off and turn on the device.
2. HIDDEN TEST MENU
. – To enter into Test menu, open the Dealer app and enter this code: *#*#7378423#*#*
. – From here you can test Cameras, Microphones, Loudspeakers, Earpiece, Touchscreen, Display, GPS, Accelerometer, Proximity switch, Pressure sensor, Compass, Gyroscope, etc. Also you can find information for the Firmware, SIM lock status, Working bands, etc., and do a Factory reset (Reset customization).
3. HARD AND…