iPhone: Can’t Enter Recovery Mode

I was just trying to factory reset an old iPhone 6S, following these instructions provided by Apple. However, try as I might, the phone would just reboot.

Turns out my notebook’s USB port I was using to connect the iPhone 6S for doesn’t provide enough voltage and is thus ignored by the iPhone. I think this is so the phone doesn’t risk running out of power while updating.

The solution was to use a powered USB hub.

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