I've been charging my Edge 520 via a micro USB cable plugged into a wall outlet in order to avoid downloading version 5.30 upgrade. Earlier today, I noticed that software version 6.0 upgrade is available, so I plugged my Edge 520 to my PC via the same micro USB cable. The 520 turned itself on and started charging. However, my computer was not able to detect it. Any idea on how to fix this? Thanks.