Situation: The client has Cisco C9200 switch. After upgrading the software, it is loop booting and failed to start.
Troubleshooting: Reset the switch.
Option 1: Power cycle the switch. Immediately press and hold the Mode button. Hold the button till the Mode LED will go amber.
Option 2: on some switch, Power up the switch. When the LED green, press the Mode button 3 times in quick succession. Do NOT press the Mode button.
This is the image of C9000 serial switch.
Please review this step by step video:
