For firmware upgrades, it used to be that you had to have at least a certain firmware version to upgrade to the newest one. The release for 3.2.1 says that you can upgrade from any version. Is that correct? There is no minimum firmware required for 3.2.1 if done over USB?
The Update file for 3.2.1 should upgrade GC3 3.0.2 or later firmware according to 2GIG.