Taiwan Semiconductor Manufacturing Co (TSMC) blamed a variant of the WannaCry ransomware for the unprecedented shutdown of several plants, as it ramps up chipmaking for Apple’s next iPhones.

Samsung Electronics will manufacture the main chip in Apple’s next iPhone model, regaining a customer previously lost to Taiwan Semiconductor Manufacturing Co, people with direct knowledge of the matter said.

Apple is to release its new iPhone in September, with higher resolution and bigger screen, in its latest salvo in the smartphone wars, where it has lost global market share to rivals Samsung.