I have a trimble fmx 1000 rtk unlocks and have used it for 7 years with no big problems.  Anyway my modem gx450 took a crap and i replaced it with a rv55, just swapped the sim cards out.  Now the trimble doesnt see the modem.  My data provider sees the modem but the trimble does not.  What am i doing wrong?  I have replaced the micro b usb cable with new ones….