1. Power off the unit.
2. Insert the Usb key in the USB connector.
3. Power up the unit.
4. LED will blink quickly (unit is checking the file integrity).
5. LED will stop blinking (unit is erasing the memory of the processor).
6. LED will blink quickly (unit is programming the memory of the processor).
7. LED will stop blinking and remain ON (upgrade is done).
8. Unplug the Usb key.
9. Remove AC power and wait for unit to turn off.
10. Power up the unit.