Xperia Z3 No Image - Robotic Voice - Xperia Z3 Q&A, Help & Troubleshooting

Hi,
I got a Z3 which was described as stuck on the boot screen but it actually seems to work to some degree but no image is displayed on the screen and there is a robotic voice which sounds like a visual description tool/app.
When I collected the phone I was told they installed talkback then it all went wrong.
The phone turns on and displays the ‘SONY XPERIA’ start screen with a tiny strip of fuzzy lines at the bottom of the screen which disappear after a while but the white Sony text remains.
Then the backlight dims and the robotic voice starts like it is describing things on the screen BUT it is not understandable or in a foreign language. Every now and again there is a word which can be understood.
Pressing the power button it seems to lock/sleep with the voice announcement ending and it just sits there but occasionally it says something random.
If you press the power button the backlight comes on but the screen remains black - no image.
Using a stylus to tap around the screen the voice responds and it vibrates and you get pings and clicks as you would expect.
I seem to be able to get into the dialer/keyboard because it then reads outs numbers in English and possibly some letters.
Plugging in the charger the LED lights up as expected; Red - Orange - Green
It rings when I phone it and then the LED flashes white for a notification.
Powering it up while holding volume up - it vibrates 3 times.
Holding the off switch the red LED comes on and it vibrates.
When I connect it to Windows an icon appears in file explorer but blank when double clicked.
PC/Xperia companion opens & recognises it but displays the warning “Your device is locked - 1. Set Xperia to MTP mode”
I have tried one of those USB screen emulating/mirroring applications but it can’t connect either.
I tried Sony Mobile Flasher, but it tells me "Device connected with USB debugging off. For 2011 devices line, be sure you are not in MTP mode"
What can I do?
Your help much appreciated.

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