Make sure when doing any update, the device must be plugged into a power source (AC charger) and the battery is charged to at least 60%. Do not unplugged the device from the power source while doing update to prevent interruption that may cause system error.
When you update the device without connecting it to a charger, an error might occur after the update. The device will not reboot or it just sits on the Magellan logo. Sometimes it will create a glitch and produce rainbow color on the screen.