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Do this first

Make sure that the most current firmware is loaded on the receiver. The current versions are available at https://topconpositioning.com/support.
  1. Do a power cycle on the receiver (set the power to Off and On):
    1. Push the Power button.
    2. Hold the Power button for 3 to 10 seconds.
  2. Clear the NVRAM and restore the default settings.
    ADDITIONAL INFORMATION:
    This restores the receiver’s parameters to the factory default settings and erases the almanac and ephemeris files. This procedure does not delete data files from the receiver memory.

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