https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-small-business-300-series-managed-switches/smb4985-administrator-password-recovery-for-300-and-500-series-manag.html
smb4985-administrator-password-recovery-for-300-and-500-series-manag
The objective of this document is to show you how to recover and configure the administrator password for 300 and 500 Series Managed Switches
administrator passwordrecoveryseries