Thank you for your inquiry. Unfortunately, there is no update to allow the MB559UEA-1S to accept drives larger than 2TB, as it is a very old product and its hardware cannot be changed. We did have newer versions of the MB559 series with updated connection types and support, but this series have been discontinued. Our closest product that accepts 3.5" drives in a single external bay would be the MB981U3-1SA ( https://www.icydock.com/goods.php?id=133)
If you have any questions on our products, just give a reply in this topic.