⚠
warning Logitech
Error Code LED lights blue for 5 seconds
Successfully switched to Bluetooth connection mode.
? What Causes This
Normal operation - Mute button pressed for 3+ seconds to switch modes.
✓ How to Fix It
No action required. Device is now using Bluetooth.
Source: page 5 of the official manual
From the manual
This error code appears in:
Logitech G435 Wireless Gaming Headset