Thanks for the response. I downloaded the firmware update, as I always do, from the US website:
http://www.iriveramerica.com/support/mtpupdate/
I turned on the T30, browsed thru all the folders there, but didn't see any file named test.dat.
As I mentioned earlier, I found instructions on the Internet for doing a manual update, but they did not work for me. The iRiver manual has the same instructions.
iRiver appears to no longer support the T30, so I am considering a new MP3 player for the near future. It definitely will not be an iRiver brand or an iPod. An MP3 player that has an optional protective case with a belt clip. I have searched in vain for the one designed specifically for the T30.