How do I re-pair the mouse with an existing Unifying receiver?
Download the Logitech Unifying Software and make sure the mouse is ON. Short press the Easy-Switch button to select the desired channel, then long press the Easy-Switch button to enter pairing mode. Open the Unifying software and follow the on-screen instructions. (Page 5)
From the official Logitech M585 M590 Silent Wireless Mouse manual, page 5
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