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

So that didn't fix it. I should note that I'm currently using a SAPPHIRE NITRO+ Radeon RX 5700 XT unaccelerated, and am hoping for kexts in the next week or so or else I'll be getting a different card. Could that be causing problems?
Please try the attached config.plist but first:
  • Change SMBIOS to iMac19,1 again and ensure that serial numbers are populated in both SMBIOS and RtVariables.
  • Then mount EFI partition of Mojave SSD using Clover Configurator --> Mount EFI or some other tool.
  • Backup existing config.plist and copy new one in its place.
  • Reboot.
Do you see any listings in PCI section? Please post screenshot.

So that didn't fix it. I should note that I'm currently using a SAPPHIRE NITRO+ Radeon RX 5700 XT unaccelerated, and am hoping for kexts in the next week or so or else I'll be getting a different card. Could that be causing problems?
Forward thinking! Love it. Shouldn't be the cause of this, though.
 

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@CaseySJ Thanks a ton! I had a few snags at first but got Mojave fully working, with L/E and Clover/kexts/other setup exactly as you explained. I've booted it about 5 times, no weirdness so far, so looks like I've got a stable build :)
Geekbenched it with GB 4 and it did pretty well, pics below...
Looking good!
The only thing left is the CPU id is wrong. I know how to change it cosmetically but I believe some pages back I saw there is a way to correctly set it with a hex value but can't find the thread now, (9900k). If you have a link or could explain that'd be great.
Sure; just click here.
Also my SMBIOS is iMac 18,3, will this affect being able to set the CPU id correctly, and would I see any worthwhile gain from changing the SMBIOS to 19,1 or is it negligible?
Pro A/V applications can indeed see a significant bump in performance with iMac19,1. However, keeping iMac18,3 may still allow you to set CPU ID to 0x1005 as explained in the previous link. I have not tested this myself, however.
 
** FYI: In-Place Upgrade from Mojave to Catalina **

Post #1 now contains 2 links for information on upgrading from Mojave to Catalina.

Screen Shot 2019-10-08 at 6.29.44 PM.png
 
@CaseySJ

Mojave upgraded to Catalina -> Success (Updated VirtualSMC and kexts first).

SMBIOS is iMac 19,1 with iGPU enabled, Sidecar -> Success. I had to update my iPad first (12.9 Pro 2nd Gen).

Using OsxAptioFix2Drv-free2000. Fenvi FV-T919 PCIe WiFi/Bluetooth (BCM94360CD).
 
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This reply posted from SideCar! (After switching to SMBIOS iMac19,1.)

This is all the proof we need. Switching to a non-T2 SMBIOS allows SideCar to work.

IMG_0226.PNG

P.S. Also tried iMacPro 1,1 (which has T2) but did not work.
 
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Here is an interesting conundrum.
I wiped a drive, formatted and installed clover.
Copied over my main boot drive via CCC and then mounted the EFI and copied my boot EFI.
Ran it to test (worked fine) and installed Catalina.
The installer ran once (as if it were a thoroughbred instead of a hack, took 35 minutes with a single launch).
Rebooted and ran fine... except.
Won't see any monitors but the primary (possible I don't have latest Lilu/Whatevergreen) but the real issue is this... I now have a "Data" partition which is a mirror of the main partition sans personal files. Basically it just looks like a clean install.
Also Clover will no longer mount the EFI partition of the drive.
I suspect the install didn't go right and that extra "data" partition is a remnant of the process.

Any ideas HackFam?
 

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Also Clover will no longer mount the EFI partition of the drive.
I suspect the install didn't go right and that extra "data" partition is a remnant of the process.

Any ideas HackFam?

DATA partition is no problem, it's a new method from Apple.
 
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