After putting in my SSD and I did a fresh Windows install (deleted/wiped all the partitions in the eMMC and SSD during Win installation). Then I just restored the drivers using “Double Driver” and updated windows. Working fine for me. It now boots from SSD. The eMMC is now empty and I’m using it as data storage.
Make sure your SSD is in GPT. Drivers can be found in the download section or you could backup your existing drivers and use that.