Xperia Z3 Compact won't boot up

[YoMaIsANiceLady]

While installing update through PC companion, my computer has shutdown.

After that, my phone switched off. I've tried to switch it on, and it stops at Sony logo at the very beginning.

What I've tried to fix this problem:

1. Restarting phone

2. Hard resetting phone through small yellow button

3. Tried to fix through PC companion (it doesn't see my phone through USB)

4. Tried to load through sony's flash loader Emma. It do see my phone through USB while holding volume button down, but it can't reset my phone because it's locked.

5. Tried to load in boot menu - phone freezes before LED starts to flash and is not able to enter boot menu.

So far - no progress.

Any ideas/suggestions?

[Thommo]

Try performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone and erase all data

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP