Is the CNH version different that the OEM Trimble version?  It is my understanding that on an FMX the only difference is the splash screen at bootup is different but the software is all the same.  When I "upgraded" from an FMX to a TMX2050 the FMX was a CNH branded FM1000 but still used a Trimble flashed NAV.  Only Pro 700 units require the CHN flashed NAV