Hi Richard,
Sadly iRiver seem to be very careful not to give any phone numbers away on their web site.
The forum contains many complaints about failed firmware updates that have left the owners gashing their product and buying competitor replacements and the link to 'reply' to most of these posts has been disabled!!
Sadly it would appear to be a 'throw em out cheap and forget 'em' type of company. Nowhere on their website is any help given to those who have blown a firmware upgrade.
Those buying an MP3 player may take note!