I installed Nvidia Driver 387.10.10.10.40.105ĭuring the instal I was asked to "allow" due to security settings. I downloaded the latest Nvidia driver for that specific build from Nvidia. That card is natively supported under HS. The GTX card is 4 Gb and I'm replacing it with a Radeon RX580 8Gb anyhow. Other than that, I don't know what else to tell you. In the Nvidia Driver Manager Preferences under the ECC tab, I get the following. Nvidea web driver is 387.10.10.10.40.105 and is given as being "up to date". Installed both your links as given by you above. GeForce GTX 980 will not run and is not even recognised by HS. Once again I tried to use the links you have given me with same result. The Nvidia GTX 980 still will not run under HS as it's not supported but I'm ok with that as I have a Radeon Nitro+ RX 580 (8Gb) on the way. There was a further update to my Boot ROM during this process but it was part of the instal and went without a hitch. Once the Mac was flashed to 5,1 I was able to grab a copy of the latest High Sierra from Apple and instal it to a fresh new HDD. *Note: Earlier versions of MacProEFIUpdate.dmg did not work for me. I then was able to use the latest version of MacProEFIUpdate.dmg (I used the Sept 2018 version) and the Mac Pro 2009-2010 Firmware Tool with no problems. Using that, I was then able to update my Boot ROM from 04 to 07 as that is what was preventing my machine from flashing to 5,1. I was able to get my machine to flash to 5,1 by installing a complete fresh install of El Capitan to a new HDD. Used my old GT 120 (thank goodness I kept it).
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