Performing a hard reset will give you the option to upgrade, reinstall or install other versions of Amber OS.
To hard reset:
1. Use a pin or paperclip to press the reset button AND press the power button simultaneously for 10 seconds. Amber X will beep twice.
2. Open a web browser and go to http://latticenode.local/#finder. Connect to your Amber X.
3. Select Reboot or Advanced Options.
Under Advanced Options, you will have the option to Upgrade OS, Reinstall OS, or Install other Versions.