The update is expected in the coming months and will roll out first to developers.
Apple keeps a famously tight grip over its software but was forced to be more transparent than normal after some iPhone owners noticed late last year that their phones became significantly faster with a new battery. The company faced customer outcry after it then confirmed that its software limits the speed of some iPhones with older batteries — to preserve battery life. The fallout from that revelation eventually prompted a rare apology from Apple. The company also offered a discounted $29 battery replacement to people with phones affected by the software — the iPhone 6, iPhone 6s, iPhone SE and iPhone 7.
While many iPhone owners were upset about the performance drop, many were also outraged that Apple didn't give customers a choice and was not upfront about what it was doing — sparking a slew of lawsuits around the world.
Cook said Apple could have handled the situation better, and he tried to put to rest suspicions that Apple was slowing older iPhone models to sell new ones.
“Maybe we weren’t clear,” he said. “We deeply apologize for anyone who thinks we have some other kind of motivation.”