How to root Xperia U / Sola

     Go to settings > Security > Mark  "Unknown sources"

     Settings > Developer options > Mark USB debugging

1. Rooting 6.1.1.B.1.54 = We cannot root this build directly , hence we need to flash 6.1.1.B.1.10 Kernel, run the rooting toolki, and then flash 6.1.1.B.1.54 kernel.
   1. So download and flash the respective 6.1.1.B.1.10 kernel for your phone. ( to learn flashing , see above )
      • Xperia U > Kernel   Xperia Sola > Kernel
   2. Download the Rooting Toolkit > Link 1 / 2 / 3 / 4 . extract it and run it. Select Normal mode and follow the on-screen instruction it shows
   3. Flash the 6.1.1.B.1.54 Kernel
      • Xperia U > Kernel    Xperia Sola > Kernel
2. Rooting 6.1.1.B.1.89 = We cannot root this build directly , hence we need to flash 6.1.1.B.1.10 Kernel, run the rooting toolki, and then flash 6.1.1.B.1.89 kernel.
   1. So download and flash the respective 6.1.1.B.1.10 kernel for your phone. ( to learn flashing , see above )
      • Xperia U > Kernel 
   2. Download the Rooting Toolkit > Link 1 / 2 / 3 / 4 . extract it and run it. Select Normal mode and follow the on-screen instruction it shows
   3. Flash the 6.1.1.B.1.89 Kernel
      • Xperia U > Kernel
3. Rooitng 6.1.1.B.1.10 = Download the Rooting Toolkit > Link 1 / 2 / 3 / 4 Extract it and run it. Select Normal mode and follow the on screen instructions.