shahrzad sharifi  من sony x peria z دارم گوشی من هم همینجور شد به روش زیر گوشی رو ریست کردم درست شد:  To wipe the cache partition, follow these steps:     While the device is on, press and hold the Power and Volume Up keys.  Wait for the screen to shut off and the device to vibrate once (about 3 seconds.  Release the keys once the screen has shut off.  Press the power key to turn the device back on.