We offer a firmware upgrade service which can be ordered here

The Iridium 9555 firmware version HT19002 is available for download below.

You will require a computer running Windows 10

This firmware update provides improved performance with Iridium’s new constellation

Checking firmware version on Iridium 9555 handset:

Navigating to:

  • Menu
  • Setup
  • Phone Information


Download the Firmware and Instructions from

Iridium 9555 Firmware and Instructions Link

Having the firmware ready is a 2 step process

  • Download firmware
  • Unzip firmware


Please follow the instructions available in the PDF downloaded with the firmware above.

You will need to connect the computer to the Iridium 9555 via the USB Cable