ENGINEER M2 Screw Extractor Pliers - Remove Stripped, Broken, Rusted Small Screws For Diameter 0.08-0.1 inches (2-3.5 mm), ESD Safe Made in Japan PZ-57

That was definitely a Phillips PH0 screw, and you’ve definitely damaged it by using the wrong driver trying to remove it. If you are lucky, a good quality PH0 screwdriver can still remove it. If not: https://www.amazon.com/ENGINEER-M2-Screw-Extractor-Pliers/dp/B001D7KU7W