• CORE 500™ ECG Troubleshooting
• CORE 500™ Bluetooth Troubleshooting
• CORE 500™ Power and Display Troubleshooting
• CORE 500™ Sound Troubleshooting
• CORE 500™ Chestpiece Cover: Quick Start
• How to Secure the Rubber Ear Tip on Your Earpiece
• Hard reboot the CORE 500™
• CORE 500™ firmware update mode (box with arrow)