How to Boot Into Sony Xperia U Fastboot Mode XPERIA U FASTBOOT MODE Using Hardware buttons Using ADB (Android Debug Bridge) Using QuickBoot App What is Fastboot? Fastboot allows you to re-flash partitions on your Android device. It works through PC command line and connects over a USB connection with your device. Not every Android device manufacturer allows Fastboot access to end-users, but thankfully Sony does allow it. On Sony Xperia devices you can unlock the bootloader using Fastboot and then flash/modify system or recovery images or completely wipe device�s data easily using the command line on your PC. Also, if you ever come across the term �Bootloader mode� than know that it�s the other name of Fastboot mode. Both these modes are one and the same thing. There are multiple methods to boot your Xperia U in Fastboot mode. The most handy (and hardware coded) method is about pressing a particular hardware button while connecting the device to PC . Others are software based, let�s hav...