https://www.fda.gov/medical-devices/safety-communications/update-zoll-lifevest-4000-wearable-cardioverter-defibrillator-software-update-potential-lack?
UPDATE -- Zoll LifeVest 4000 Wearable Cardioverter Defibrillator - Software Update for Potential...
The FDA is reminding users of the Zoll LifeVest 4000 to contact the manufacturer immediately for a replacement device if their device displays the message:...
updatezolllifevestwearabledefibrillator