How to update openerp after modifying base.xml?

Hi,

I am new to bitnami openerp on EC2.

I tried to update the "Generated by Openerp.com" words in invoice. I updated all the related base.xml.

However, the invoice doesn't changed.

I tried:

openerp-server -d bitnami_openerp -u all

But it paused at: OpenERP server is running, waiting for connections...

any clue?

Thanks! Arthur