Why won't my Wi-Fi setup mode work after pressing the Wireless button?
If the Wireless light does not blink blue, restart the Wi-Fi setup mode by pressing and holding the Power button for 5 seconds until all control panel buttons light up. Press and hold the Information and Resume buttons together to make the Wireless light blink blue.
From the official HP Laserjet M207 M212 Printer manual, page 3
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