Cisco Support Community
If the administrator username and/or password has been lost or forgotten or the device is being reconfigured, a hard reset can be useful. All settings and information on the device will be reset to defaults.
The article will explain how to perform a manual reset on the ESW-500 Series Switches .
• ESW520 and ESW540 Switches
Performing a hard/Manual reset
Step 1. Switch can be manually reset by inserting a pin or paper clip into the RESET opening.
Step 2. Press the manual reset button for 0 to 20 seconds.
Step 3. Pressing it for 0 to 10 seconds will reboot the switch.
Step 4. Pressing the manual reset longer than 10 seconds will result in switch being reset to its factory defaults .