Hola/Hallo/Hello Alfred!
 ADR> I do not have a SupraExpress 288 but a SupraFAXModem 288 V.34 PC
 ADR> pack. I do want to upgrade my modem to the new standard of V.34
 ADR> (33k6).
 ADR> What is the procedure if I want to upgrade the modem in the U.S.A.?
I believe you are talking about the hardware upgrade for modems that answer 
to "ATI3" with "RC288DPi Rev 04BC". I think they would refuse to upgrade in 
the USA for European clients. In the information provided on the Internet 
they explicitly tell to to contact France or UK for that. 
I am in the same situation like you. I am really fed up with this upgrade 
business. I tried to call Diamond UK about it and I never got any further 
than the "waiting room" music. They really don't consider international 
customers. I asked technical support if they could give any email address or 
Fax but never got any answer. 
I decided not to buy the upgrade. Several have complained that it doesn't 
reach alwsys the 33.6k. So I think it is just a waiste of money for that 
could-be 17% gain.
I wait until the 57.6k standard comes out and will buy that generation from 
the competition; they offer it as a flash-upgrade on one of their present 
modems!. 
If I were you, I would do the same.
Saludos/Groetjes/Bye, 
 Rene
---
---------------