How do I restore my printer's network settings?
First, remove the USB cable from the printer. For a 2-line control panel printer, press and hold the Wireless button until the Ready LED and Attention LED start blinking simultaneously, then release the button. For a touchscreen control panel printer, go to the Setup menu, select Network Setup, then select Restore Defaults/Restore Network Settings. The printer will restore network defaults automatically and restart.
From the official HP Color Laserjet Pro M255 M256 Printer manual, page 9
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