There is a design flaw in the Logitech MX Master 2S. The good news: You can fix it yourself. – Rienk Jan Schurer
MX Master 3 won't connect to any devices, can't unpair or pair with anything. LED just flashes red and green. Happened after updating firmware with Logitech Options. No buttons work. Has anyone
i need help, my MX master 2s broken or something : r/logitech
Fix: Logitech MX Master 3 Buttons Stop Working or Not Responding