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Lumia 640 DS developer mode is not visible

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By RaphiDX, Junior Member on 24th September 2018, 04:56 PM
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I'm trying to activate the developer mode on my Lumia 640 but it isn't listed under "update & security"

Model: Lumia 640 Dual Sim
Software: Windows Phone 8.1 Update 2
Version: 8.10.15148.160
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