See this Trimble Support Note per upgrading the OS for the TDC600

Why Upgrade?

The TDC600 Operating System has been updated with the latest security patches. Additionally, some applications
have been removed from the new version of the Operating System in order to further improve security on the
device. It is highly recommended to complete this upgrade as soon as possible.

2 notes:

  • A Micro SD Card (Minimum 8GB is need per this upgrade.
  • Use the TDC600 power supply during this upgrade.