this is what I could found on Garmin knowledge base:
Why do I get the error message "I/O device error" when using Garmin applications with my device?
Answer:
This error message indicates a communication error when software is being written to a device. If you receive this message, try the following:
Ensure that the device is connected directly to your computer and not a USB hub
Try another USB cable or USB port on your computer
Disconnect all other USB devices except for Keyboard and Mouse (i.e. printers)
Update the software on your Garmin device by using WebUpdater
Update the software on the Garmin application you are using
If you continue to receive this error message, try using another computer to rule out a configuration settings issue.
Code:
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