All passwords changed after import of sample customer dump.

I created a new ORacle instance to import a customer database and try to reproduce a customer reported problem. But the import changed all the passwords (sys/system/internal) and I don't know of a way to connect to the instance now. Is there a way to change the password without connecting to the DB?

thanks for any help.

use oracle utility "orapwd".

when you do a full import, Oracle will use whatever the password that were created by the customer so you have to recreate the internal password and log in the database to change system and other user