The attached PDF describes the procedure to create a compact flashcard that can be used with a NetRS in the event that the OEM flashcard has failed.
You need to download the image file too (1GB).
A copy can be found here.
Article ID: 813
Created: March 31, 2015
Last Updated: January 5, 2018
Author: Jim Normandeau
Online URL: https://kb.unavco.org/article/imaging-a-trimble-netrs-receiver-compact-flashcard-813.html