Please note that firmware updates are done at the users risk, it is important to follow instructions precisely to minimise risk of damage.

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