Flash Xperia P kernel.. And let it boot up once.. Or flash Xperia Z kernel.. Boom.. Headshot.. The voltage unequality will bomb your phone and complete hard brick.. And now... The second part... Pull out battery.. Put it in fire..
The final part...
Fill some water in your bowl.. Let it boil... Add much salt.. Now disassemble your Sola (you can try throwing at the wall.. it's easy for you)...
Now put your motherboard of Sola in the boiled salt water.. Let it melt..
Voila... Now you have a dead phone... A very very very dead phone...
Hahah... Jus joking.. Why ?? You're not happy with that phone? Come on, it's just a phone
Phone: Sony Xperia U
ROM of XU: I flashed a lot
Kernel: Same as ROM