This article provides guidance on updating your Iridium 9555 handset to firmware version HT19002. This version is compatible with all Iridium 9555 hardware revisions from HT11001 and later.
Important: This update must be performed using a Windows computer.
Before Your Begin
Check Your Current Firmware Version
- From the main screen, press Menu.
- Scroll to Setup, then press Select.
- Scroll to Phone Information, then press Select.
- Your current Firmware Version will be displayed at the top of the screen.
Prepare for the Update
Before starting the firmware upgrade:
- Use a Windows computer only (macOS is not supported).
- Remove the SIM card and reinstall the battery.
- Ensure both the phone and computer batteries are fully charged.
- Disable Bluetooth on the computer to prevent conflicts.
- Do not disconnect the device or press any buttons during the upgrade.
- The phone screen may go blank during the process—this is expected.
The full update may take 20 minutes or longer to complete.
Step-By-Step: Updating to HT19002
1. Download and Run the Installer
- Download the HT19002 installer from: https://www.iridium.com/idr-file/303126?idr_force_download=1.
- Once the installation is complete, click Open file.
- Run the file:
Iridium 9555 Software Upgrade HT19002 Installer.exe - The installer will place the Upgrade Tool and USB drivers, into the following location:
C:\Program Files\Iridium\9555\Directory.
Follow the on-screen instructions to allow, continue, or next, depending on your computer's pop-up notices.
2. Connect the Phone
- Connect the Iridium 9555 to your computer using the USB cable.
- If this is your first time connecting the handset to this PC:
- Windows will show automatically a notification "New Hardware Installed". Wait for it to show before proceeding.
- If Windows cannot locate the driver, browse to:
C:\Program Files\Iridium\9555\USB\VCOMPORT
3. Launch the Upgrade Tool
Navigate to the upgrade tool manually:
- Open File Explorer
- Go to:
This PC > OS (C:) > Program Files > Iridium > 9555 > Upgrade_Tool - Double-click:
Iridium 9555 Software Upgrade HT19002.exe

4. Complete the Firmware Update
- Follow the on-screen instructions provided by the upgrade tool.
- The process may take 20 minutes or more.
- Do not interrupt the update.
Once complete, the device will reboot and operate on the new firmware.
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