Hi,
normally default user name and password is admin/admin. for WLC recovery,
After the controller boots up, enter the Restore-Password command
at the user prompt. This command is only accepted for the initial
user login and becomes disabled after a user logs in. You are
prompted to enter a new username/password, which can then be
used to log into the controller and modify settings.
Please rate this and mark as solution/answer, if this resolved your issue
Good luck
KB