TRIMBLE R4s Receiver Firmware Update

before 6 APRIL 2019

Procedure to upgrade your TRIMBLE R4s GNSS Receiver to the latest Firmware Version 3.81



  • Download the R4s Loader software
  • Un-zip the downloaded file on your PC.
  • Run the TrimbleR4sLoaderSetupV7_1_0.exe file and follow the steps to install R4s Loader software.
  • An icon / shortcut to the R4s Loader software will be created on your desktop.


  • Download the V3.81 Firmware file.
  • Copy the downloaded r4s_upgrade_v3.81.tar firmware file to your PC.


  • Insert a fully charged battery in your R4s receiver.
  • Switch the R4s receiver ON.
  • Connect the R4s receiver to your PC using the USB cable.


  • Run the downloaded R4s Loader software (from the icon on your desktop).
  • Select the COM port corresponding to the USB cable.
  • Press the [Upgrade] button
  • Select the downloaded r4s_upgrade_v3.81.tar firmware file.
  • Press the [Update] button and wait for the receiver upgrade to complete.

Note:   Your receiver has to be under warranty in order to be successfully upgraded.

For assistance in this regard, please contact the OPTRON Helpdesk:
Tel:      0860 999 007 (Shared Call)  |  +27 12 683 4500 (International)

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