Thanks for the reply, Senter, but I tried each of your suggestions individually, but each got the same response from SEUS, latest software already installed. I did upload them one at a time via A2 uploader, and turned the phone back on each time to let the update take effect before trying SEUS. If I could find the files myself, I'd just flash the phone and be done with it. None of the websites that have firmware downloads seem to have R1G for W508 yet, though.

Thanks again for your help!