Logitech G403 Driver Download & Update for PC - Driver Easy
Update Your Logitech Firmware With the Logitech Firmware Update Tool - YouTube
Don't. Just don't. G502 HERO firmware update through G HUB is broken. Waited for over 1.5h with the mouse "updating" and not working, and at the end had to disconnect and reconnect
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LOGITECH G102 FIRMWARE UPDATE - MAX DPI INCREASED TO 8000!! - YouTube
Logitech g602 software and firmware update, connection utility