Strange hotspot name disables Wi-Fi, and rebooting doesn’t fix it

Look out — there’s a new iOS bug that can kill your iPhone or iPad’s Wi-Fi functions if you connect to a hotspot with a very unusual name, or SSID. 

You won’t be able to connect to another hotspot, and rebooting the iDevice doesn’t fix the problem. But there is a way to get out of the hole without completely factory-resetting your iPhone or iPad.
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