OK, so my iRiver has been working fine for the last week.
I just tried a sample recording on it, and when I pressed stop to end the recording, all hell broke loose. The unit froze, so I did a reset, and now I can't fully format or anything. It just hangs during format, and it won't boot into rockbox, it tries to, and then some message "return -4" comes up and it goes back into the iRiver firmware.
Any suggestions? If it's fucked, I'm going to try and get my money back from the ebay seller -- or worst case, file a report with ebay/paypal if that will get me anywhere.