USB connectivity is a common issue with a failed update process:
Make sure to check all cable connections, and USB ports for proper connectivity. The Pod Go should be connected directly to the laptop or computer with USB 2.0. No hubs or secondary connections. If it's a desktop computer (standing tower), then you may need to connect to the back of the computer near the power source. Proper USB 2.0 ports will provide enough USB bus power for your POD update.
For Windows PC users: