Quick Post ;P. Yesterday I Reset my Access Switch 3com SuperStack3 3C17701 :

  1. Plug console cables the switch, open the terminal using what ever our utility.
  2. using username : recover; password: recover.
  3. switch will count down and we must quick hard power off the switch
  4. Power ON the Switch then IOS need us to input the new password for admin username.
  5. ta daaaa we got our admin user back

notes :

I try only this model switch only never try on 3com 5500G (L3 Switch).