Help not booting

[Brokenintwo]

Hello everyone , I am having a major problem with my xperia arc LT15i , Last night I upgraded my phone to 4.1.B.0.431 and now I cannot start it , everytime I press the power on button ,the phone wont turn on and the LED light on the right side flashes red 3 times . Last night ,I connected the phone to my PC and opened the sony ericsson companion software which showed that I have an update for my phone , I upgraded it and left it overnight and the next morning the update was over and the phone turn off , followed the instruction and disconnected the phone from my PC and tried to switch on but failed .
I would greatly appreciate if somebody can provide me with a solution to this problem .

 

[Jake-SonyXperia]

With the information supplied, I suggest downloading and install the Update Service software, this will allow you to repair the software on the device and bring it back to life. I have supplied a link below that will allow you to download this directly.

Update service - Sony Smartphones (Global UK English)