The Iridium GO! exec has a physical reset button located inside the SIM cover. You will need a small paper clip or pin to press the button through the small hole.
Pressing the button for >1 second and release while the unit is powered on will force the unit to reboot.
Pressing the button for >10 seconds while the unit is powered on will force the unit to perform a factory reset. The unit will automatically shut down and then reboot.
During rebooting, it will show the following screen to indicate it is performing the factory reset. There are NO screen prompts.
After completing all configuration (including Settings, Call History, ESP Configuration, Admin & Screen Lock PINs) will be deleted.
Note: After a factory reset the SOS feature will need to be reactivated.