Lock screen plays a looping video and I cannot setup a screen lock. A padlock covers the number pad

[CPK]

As above, when my screen locks a video plays. This is whether charging or not. I cannot get it to stop playing this video. Also, when I try to set up a PIN for my phone. A padlock appears over the number pad. I have also tried then to set up a swipe lock. The number pad again gets blocked by a Padlock.

Any help will be much appreciated.

[Qatrium]

Video on the lockscreen? Never saw this before. Can you take a screenshot and put on dropbox and post the link here?

[CPK]

It's basically like a computer screen saver. So when I attempt to take any screenshot of it, or touch the phone at all, it disappears. Problem is, the phone screen never actually turns off. I have left it sitting here for ages on the charge. It sits there, looks like its about to go to sleep then up comes the videos of Z3 features etc.

[Qatrium]

This looks like a demo unit behaviour, can you go to Settings -> Display -> Daydream and make sure it's off?

[CPK]

Yeah daydream is off. I thought Demo behaviour too. But I can make calls etc, which surely I could not do on a demo device?

[Qatrium]

What if you change the theme? 

[CPK]

Yeah that didn't fix it either. I have come across 3 retail apps buried in the device. I have managed to manually stop one and disable two more. This stopped it, however, upon restarting the phone. Its back again I have no option to uninstall the RetailDemo app which is always running. It is completely greyed out.

[Qatrium]

I think you have demo unit there, not sure about the calling feature if it's really off on demo units. Last think I can advise is trying PC Companion phone repair.

Open PC companion -> Support zone -> Phone/tablet software update -> Repair my phone/tablet (blue link style). Follow the steps given, do not connect your phone until prompted to press volume down while plugging USB cable.

http://www.sonymobile.com/gb/tools/pc-companion/

[CPK]

Thanks for your help. I will try this now

[CPK]

Well, unfortunately, this didn't work either It is 100% an app called Retaildemo. I just cannot delete it.