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When you do that, iOS will enable Developer Mode on your iPhone and you should be able to use the TeleMessage WhatsApp Phone Archiver inside the iOS 16 beta. Tap Turn On inside this prompt, as seen in the image below:
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When you unlock your iPhone, a prompt should appear on the screen asking you whether you wish to turn on Developer Mode on your device.
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Once it restarts completely, unlock your device using the passcode.
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