Lenovo's ThinkPad lineup of business laptops generally come with great upgradeability options, and although RAM is soldered to the board in the X390, you can swap M.2 PCIe solid-state drives (SSD) with relative ease. We've put together a complete guide to help you through the process, and we've made some recommendations as to what hardware you can use for an upgrade.
Full story from the WindowsCentral blog...