I own a c250 with firmware version 03.02.05A. My primary system is a windows xp professional sp2 pc with USB version 1. When I attempt to connect the player to the computer, the computer recognizes a new hardware device and begins the process of ‘negotiating’ a connection. Almost inmediately the connection is lost. Every few seconds that the device remains connected, the same thing happens, over and over. Looking at the device display, I can see the connection ‘negotiation’ looping over and over: ‘Writing’, ‘Connected’, ‘Disconnected’, ‘Refresh database’, and so on. This happens whether I attempt to connect the device using the default MTP mode or the MSC mode.
My secondary system is a pc running the same version of windows xp, but equipped with USB version 2. The player successfully
connects, every single time, without a single issue, in MTP or MSC, and I have successfully transferred files to the player using MSC mode.
I am stumped as to what is going on. I don’t think it’s a faulty hardware issue on the part of my systems. I’ve tried all four available USB sockets on my primary system (the one with the issues) with the same results. All four slots have never had this problem before, either with my old mp3 player or different USB devices. I’ve ruled out a problem with the cable used to connect the c250 to the pc since I’ve used the same cable with both computers, getting an issue on one and not a single problem on the other. As far as I can tell the only difference between the two computers, as far as the c250 is concerned, is the version of the USB standard. Any ideas?