History
The third Rescue Armor was built by a digital back-up of Tony Stark's mind,[1] which was booted up by Pepper Potts after the real Tony Stark had been victim to a magical spell that inverted his moral compass and turned him into a twisted version of himself.[2]
Pepper confronted Tony on the Rescue Armor, and used a sonic attack to neutralize Tony's Endo-Sym Armor, believing it'd be vulnerable against such attacks due to being based on Symbiote biology. While the armor was actually protected against sonic attacks, Iron Man took the opportunity to feign defeat, so Pepper would bring him to the Resilient HQ, from where he could upload a virus to shut down his digital duplicate.[1]