Black screen after Xperia System Update on Z3+........NEED HELP!!! - General Questions and Answers

I downloaded an Xperia update today and installed it.
However the update seems to have affected my screen in that, if i switch on the phone it loads up until the lock screen, so the screen is still working, but then it immediately goes black, not allowing me to unlock the phone.
The phone is working as i can hear notifications and it is charging.
I thought i could reinstall the update through Xperia Companion but it is telling me to unlock the phone first, which i cannot do because fo the black screen.
If i go to repair the update in Xperia Companion, then that will delete all of my data which i don't want to do.
So i thought i could backup my data first........but to do so i need to change to MTP mode.......and to do so i need to unlock my phone!!
So i'm stuck with a phone that was bricked by the Xperia update.
Can anyone please offer advice on how i can get my phone working again???
Phone is an Xperia Z3+ with stock OS, not rooted as i could never find a way to do it!

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shriwesley said:
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Click to expand...
Click to collapse
Use Flashtool and flash stock FTF file in your device. Hope that helps.

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