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[SUCCESS] Gigabyte Designare Z390 (Thunderbolt 3) + i7-9700K + AMD RX 580

Please let us know if the problem turns out to be monitor- or cable-related per your earlier post.


So far different cables gave the same results... I'll try to get another display and check soon. Everything works great, and the second HDMI display input looks better than the first one, and on startup the display ratio and resolution is perfect. I double checked all the settings and compared it with your framebuffer patching guide, all seems to be good. Maybe it's just the monitor... will update tomorrow/Tuesday.
 
OK. Tried USB 3.0 and USB 2.0 on several devices, trying different USB port and multiple times. The installation always stops at "An error occurred validating the installer data. The download is either damanged or incomplete. (Redownload the installer and try again.)" about 3/4 of the progress bar or with "About 2 minutes remaining" in. This is on a Mojave 10.14.4, so not covered yet in the instructions. Does anyone know how to get past this? Alternatively, does anyone know where to download 10.14.3 so I can rule out it's a difference that needs to be covered in additional instructions? Thanks in advance for all your help!
 
The only thing special I am running for the Vega is the VegaTab64.kext.
EDIT: My cards actually have two different names (see screenshot from System Profiler). Possibly this is the cause. I am not sure how to create an SSDT to rename the cards.
Other than that, this is all I have going on in the Devices panel:
So I now have the iGPU showing up in iStat, Both Vega cards appear in the SystemProfiler, Premiere (yuck) and Cinema see both Vega cards but apparently I am stalled at addressing the iGPU. FCP won't render h.264 and Resolve will not launch.
And in a probably unrelated issue, my Gigabyte boot screen sometimes doesn't appear.
 

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So I now have the iGPU showing up in iStat, Both Vega cards appear in the SystemProfiler, Premiere (yuck) and Cinema see both Vega cards but apparently I am stalled at addressing the iGPU. FCP won't render h.264 and Resolve will not launch.
And in a probably unrelated issue, my Gigabyte boot screen sometimes doesn't appear.

Most likely not helpful but I just noticed that all I need to do was hit the refresh button in Videopro and it loaded for the first time. I've been fighting this one for a month.
 
OK. Tried USB 3.0 and USB 2.0 on several devices, trying different USB port and multiple times. The installation always stops at "An error occurred validating the installer data. The download is either damanged or incomplete. (Redownload the installer and try again.)" about 3/4 of the progress bar or with "About 2 minutes remaining" in. This is on a Mojave 10.14.4, so not covered yet in the instructions. Does anyone know how to get past this? Alternatively, does anyone know where to download 10.14.3 so I can rule out it's a difference that needs to be covered in additional instructions? Thanks in advance for all your help!
Have you tried a different USB stick? From the Installation Procedure in Post 1:

Use a good quality USB drive. It seems we all have some decrepit USB drives from yesteryear. Don't use them! Buy a new high quality USB 3.0 drive from a reputable manufacturer.
 
Have you tried a different USB stick? From the Installation Procedure in Post 1:

Use a good quality USB drive. It seems we all have some decrepit USB drives from yesteryear. Don't use them! Buy a new high quality USB 3.0 drive from a reputable manufacturer.
USB 2.0 sticks normally works better
 
Not a problem with the quality of the drives, they are SanDisks and I tried several ones.

The installer log has this set of lines that seem to indicate the problem. Please note that the file name used in the line "Validating asset: ..." ends in .dmg.partial vs. .dmg.partialState on the actual drive.

Mar 31 15:18:52 iMac osinstallersetupd[623]: Started downloading package com.apple.dmg.InstallESD (linkfile:///Volumes/Image%20Volume/Install%20macOS%20Mojave.app/Contents/SharedSupport/InstallESD.dmg)
Mar 31 15:22:31 iMac osinstallersetupd[623]: Validating asset: /Volumes/Mojave/macOS Install Data/InstallESD.dmg.partial
Mar 31 15:22:31 iMac osinstallersetupd[623]: Will verify dmg as pkgdmg.
Mar 31 15:22:31 iMac osinstallersetupd[623]: Getting offset for dmg in pkg: /Volumes/Mojave/macOS Install Data/InstallESD.dmg.partial
Mar 31 15:22:31 iMac osinstallersetupd[623]: Verifying InstallESD.dmg
Mar 31 15:22:55 iMac osinstallersetupd[623]: Failed to validate
Mar 31 15:22:55 iMac osinstallersetupd[623]: Failed to retrieve linkfile:///Volumes/Image%20Volume/Install%20macOS%20Mojave.app/Contents/SharedSupport/InstallESD.dmg (Error Domain=com.apple.osinstallersetup.LinkFileDownload Code=8 "An error occurred validating the installer data. The download is either damaged or incomplete." UserInfo={NSLocalizedDescription=An error occurred validating the installer data. The download is either damaged or incomplete., NSLocalizedRecoverySuggestion=Redownload the installer and try again.})
 
Also, this is the file version downloaded from the App Store
Screen Shot 2019-03-31 at 3.55.53 PM.png
 
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