And different regulatory practices in different countries - as well as varying reactions from carriers - have caused a degree of customer uncertainty and confusion that is hampering Samsung's efforts to get the recall behind it as quickly and painlessly as possible. In a half-page ad carried by major South Korean newspapers on Wednesday, Samsung announced a Note 7 software update that will limit battery recharges to 60 percent of capacity. It would prevent the phones from overheating, and thus exploding, but would effectively mean a downgrade of the high-end device. Replacements coming Samsung Electronics America announced that replacements for Galaxy Note 7 smartphones will be available at retail locations in the US by September 21. "Our collaboration with the CPSC to fast-track a voluntary recall in the US addresses safety concerns by ensuring we reach Note 7 owners quickly to exchange their devices," Samsung America president Tim Baxter said.