I take it the optical slave mode isn't any good for what you're doing?
kenro is the company that will update your flash for free just pay postage
you will have to give them a call
Kenro Ltd
Greenbridge Road
Swindon
SN3 3LH
Telephone: 01793 615836
Fax: 01793 530108
email: sales@kenro.co.uk
i also need to get round to sending mine in hope this helps