Firmware Upgrade guides
Firmware Upgrade IsatPhone
Before upgrading your IsatPhone, the USB drivers have to be installed.
They can be found here for the IsatPhone Pro: http://www.iec-telecom.com/technical-product/inmarsat-isatphone-pro/
They can be found here for the IsatPhone 2: http://www.iec-telecom.com/technical-product/inmarsat-isatphone2/
To install the USB drivers for the IsatPhone Pro refer to this:
For the IsatPhone 2 follow the software instructions.
Then download the firmware and follow the firmware upgrade guide instruction.