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It may be that your laptop/PC does not have the relevant drivers.
Have you installed any software that may contain the drivers?
Alternatively pop into the Garmin 305 Forum and see if there is any helpful advice in there
You tried to disconnect your device from your computer and restart the machine then try again? or alternative;y reinstall USB drivers. I'd say it's unlikely to be the cable itself.
Is the problem with the Garmin or the computer's USB ports?
That is, do other USB devices work when plugged in? If they don't, look in Device Manager and check for little yellow exclamation marks. You might need to reinstall the computer's USB drivers or might have a hardware fault.
If other devices do work the problem could be with the Garmin. Start by going to Garmin's website and downloading the Communicator plugin, which enables the 305 to talk to the computer.
Oh well. That's what sorted it for me when I had a similar issue recently.
Only other thing I can suggest is trying the 305 on another computer to see if the problem lies with the 305 or your usual computer.
Good luck anyway!
I used my forerunner 110 for the first time yesterday (great piece of kit by the way) and I'm unable to upload my workout for the exact same reason as the o.p. I have updated the USB drives and tried various troubleshooting suggestions, but I'm having no joy at all. The same message pops up, "USB device not recognised"
Very frustrating as I was looking forward to reviewing my run (one of the reasons I bought a forerunner). Can anybody offer any other solutions which haven't been mentioned above?
ps sorry for the thread "hi-jack" Dave, but it seemed pointless starting a new thread on the same topic. Glad you've got it sorted, there is hope for me yet!