How to find out if you have v1 or v2 Fuze
 

The easiest way to tell if you have a v1 or v2 is by the firmware version. If you have a Fuze v2, the firmware version will be 2.XX.XX. If you have firmware version 1.XX.XX, you have a Fuze v1.

To get your firmware version by:

1. Go into the Main Menu
2. Select Setting on the Main Menu
3. Scroll and select System Info

You can not switch the firmwares around because it looks like it has a small hardware changes.