Gadget II LED Status Indicators

Question

What does the status of the LED on the Gadget II indicate?

Answer

Per the Gadget II Setup Guide:

Note that the LED states differ based on the generation of Gadget II that you own. 
Any Gadget II CPU2 variant can be identified by a 'CPU2' designation on the underside of the unit. 

Gadget II (First Generation)

A bi-color indicator LED is located next to the USB connection.
The LED indicates the connection status between Gadget II and your computer.

The LED illuminates in the following conditions:

• Solid red during USB enumeration.
• Solid green once enumerated  (recognized as a USB device).
• Blinking green on receipt of a command from the USB host (Data being sent to/from program, active output).
• Slow blinking red while waiting for firmware.
• Rapid blinking red during firmware receipt/upgrade.
• Solid green once firmware upgrade is complete.

Gadget II (CPU 2)

• Solid red during USB enumeration.
• Solid green once enumerated  (recognized as a USB device).
• Blinking green on receipt of a command from the USB host (Data being sent to/from program, active output).
• While waiting for firmware, no LED will be lit.
• Rapid blinking orange during firmware receipt/upgrade.
• Once the firmware upgrade is complete, no LED will be lit.