Just need some advice with respect to upgrading the firmware on my cMP 4,1 >5,1 (see my sig for full setup). I have the following setup: • An NVIDIA GT120 (PCI slot 4 - not hooked up to a monitor usually, but can) • A Sapphire Nitro R9 380X (PCI slot 1 - attached to a 4K screen) • A Samsung 850 EVO in an Accelsior S PCI-e SATA III adapter (PCI slot 2 - this is my boot drive with admin User accounts and all the apps) • A Samsung 960 EVO NVMe in a PCI-e adapter (PCI slot 3) paired in a FD with a WD HDD (in a Direct Connect Bay) for my User data • 3 other HDDs (backups and TM) and a SDD (Win10) in the other Direct Connect and Optical Bays. What do I need to remove in order to safely upgrade just the firmware? 1. Can I do the firmware upgrade by booting from my normal PCI-e SATA III SSD boot drive? Or do I need to boot from a normal HDD? Would I need to remove the Accelsior S PCI-e SSD drive if I boot from the HDD? 2. Do I hook up the GT120 to my spare monitor (it gives boot screens)? 3. Do I have to remove the R9 380X, or can I leave it installed? 4. Do I remove the NVMe FD plus the accompanying HDD part of the FD? 5. Do I remove all other HDDs and SSD? I can boot my Accelsior S PCI-e SSD without the NVMe FD installed as I have admin User accounts on it. So do I remove the NVMe FD and all the other drives, or do I need to boot from a HDD and remove everything else? I plan to delay upgrading to macOS 10.13 HS for a month or more to make sure the kinks are ironed out by those who pioneer before me. Any/all advice welcome. Or do I simply wait for GM to be released?