How enable phone cover settings on WP8.1 GDR?

[WPCentral Question]

Hi everybody.

Today, I received on my Lumia 930 the update 1 (The gdr1) of windows phone 8.1.
I read on WPCentral, when the update was in preview, with that update if we close the case the device is locked and when we open the case the device is unlocked and we start on the starscreen. But in parameters, i can't find the setting auto unlock.
So I googled "auto unlock cover windows phone 8.1" and i found this link dev.windowsphone.com/en-US/OEM/docs/Customization/Active_phone_cover_settings]Active phone cover settings | Windows Phone Hardware Development . But, unfortunately, i'm not a developper and i don't understand to enable this option.
Could you help me?

 

[Nabkawe5]

This is not for ANY PHONE, this is for specially made cases like the DOT view case from HTC, If there's no hardware to tell your phone that you have a case on then this software will not matter.
you can't expect the phone to rely only on your proximity sensor to unlock as this will clearly be a major issue with accidental wakes.

Sorry to burst your bubble mate.