The Software Update failed xperia Z1

[JC1]

Hi have a problem i did a Software update on my Xperia Z1 and for some reason it failed and it is off went i turn it on i keep asking to connect to computer but as soon as u do that it turn off and the computer do pick up the phone i have hard rest by the power and the volum key  it stil wont work  i have rest in the sim card and sitl it keep giving me same problem how can i sort this out i am lost with out my phone

Thanks

[Hampus]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

I suggest that you disconnect the phone from any kind of power source > Hold the ON/OFF button + volume up(+) for 10 seconds and the phone should power off completely. When the phone is off, you can perform a software repair on your phone via PC Companion:

http://www.sonymobile.com/global-en/tools/pc-companion/

In PC Companion you press start on Support Zone > Start on Update the phone/tablet software > Repair phone/tablet (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.

Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.