Evening all. I have a cMP 5,1 running 10.13.6 and boot ROM MP51.0089.B00. I cannot upgrade to Mojave yet as the professional software I use (Pro Tools) is not yet stable with it. I have an Angelbird PX1 with a 1TB Adata SX8200Pro in it. For the life of me, I cannot get it to be recognized in Disk Utility. I don't care about it being the boot drive as I have a regular SSD for that which is totally fine right now. I just want to have the Angelbird in there as my super fast production drive. About to start a new Netflix show and would love to have this going before it does. I have an RX580 running but do also have an Apple EFI card I can troubleshoot from if need be. I had to use that when upgrading to High Sierra, but the 580 has been working fine for a year now. Thanks so much for any help you can offer!