Stop the SEPM Manager service on the new installation.
UPDATE SEM_MAIN_USER SET USER_PASSWORD = 'XR7g7aFwk1WjMI7Pm2BGU8WeJgG7gP2mFg==', IS_LOCKED = '0', PASSWORD_ATTEMPTS = '0' WHERE USER_NAME = 'admin'; This sets the admin password to a known default hash. The string above corresponds to the plaintext password symantec (all lowercase).
SELECT USER_NAME, IS_LOCKED FROM SEM_MAIN_USER WHERE USER_NAME = 'admin'; You should see one row returned with IS_LOCKED = 0 .