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Hundreds of thousands of implantable heart defibrillators made by Minnesota’s St. Jude Medical are getting cybersecurity software updates, while older versions of the devices may have their wireless communication systems disabled because they can’t accept the update.

A series of 11 recent recall notices said that roughly 740,000 implantable cardioverter defibrillators (ICDs) and cardiac resychronization therapy defibrillators (CRT-Ds) made by St. Jude Medical are eligible to receive new firmware that provides “an additional layer of protection against unauthorized device access.”

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