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info HP
Status Ready LED and Attention LED start blinking simultaneously
LED indicator pattern — both Ready and Attention LEDs are blinking together.
? What Causes This
Network settings reset in progress or network restore operation triggered.
ⓘ What This Means
This indicates that pressing and holding the Wireless button has triggered a network settings restore. Wait for the operation to complete.
Source: page 9 of the official manual
From the manual
This error code appears in:
HP Color Laserjet Pro M255 M256 Printer