@maijo_jacob, Welcome aboard and thank you for sharing this 2018 Mac mini build. Have you tried using the modified apple_set_os v0.5 to help resolve error 12? If that doesn’t work, revert back to using Windows 10 1903 V1 ISO and keep it at 18362.30 – .295.

@itsage, Thank you!!!

I wanted to try it but I am using a wireless Keyboard and Mouse and Mac Mini won't let me start in Startup Manager. The Option key does not get recognized when I start my mac. I decided instead of getting a new Keyboard and dreaded feeling of going to get a new Keyboard (COVID - 19), I will try to find a workaround with my existing setup.

@maijo_jacob, The nice thing about modified apple_set_os v0.5 is that it requires no user interaction at all. Once you set it up per the instructions, it will load up at every boot and go into Windows. You can then use either Boot Camp utility in Windows to switch to macOS or System Preferences > Startup Disk in macOS to switch to Windows.

@maijo_jacob

Concerning a workaround / the visibility of the start-up option -> If you are using the Apple Magic Keyboard you can connect it with the Mac Mini via the charging cable. In this case the option key works during boot-up. Did you try this?

Success

@hans-st, I have a Logitech MX Keys and I called Apple and Logitech to see if there was a way for me to use the Option Key when booting up. Apple said you have to connect to the mac via a cable but that didn't work and Logitech couldn't find a solution.

@itsage, I tried even logging into macOS recovery mode but because of my Keyboard, I am not able to access the recovery mode (Command (⌘) and R). I tried using a terminal command to boot into recovery mode but for some reason the Startup Security Utility through this method won't let me access it using this command.

sudo nvram "recovery-boot-mode=unused"

sudo reboot 

@maijo_jacob

Did you do a regular install process (hot plug in of the eGPU withHDMI cable to monitor, HDMI connection Mac Mini - monitor still attached - monitor switched on HDMI, let windows install all drivers, install current original Adrenalin driver, shut down, Power on, all connections still on) before you started the work-around? Because I have - except the Razor Core X, the same build. However, in my system the Mac Mini is connected via a HDMI cable to the monitor and the eGPU with a DP to mDP to the monitor. It was not a real challenge to get it running.

Cheers

@hans-st, 

Maybe the issue in the 1909 build was I didn't disable PCIe x16 - 1901

Great build! Nothing has worked for me, and I have tried the RED drivers from bootcampdrivers.com, but I'll give your download a try. I'm assuming you put your thunderbolt 3 cable to your eGPU closest to the ethernet then? As I think 1901 is for the port closest to HDMI. 

@skatendo, The thunderbolt cable is plugged in to second from Ethernet cable. I couldn't figure out what 1901 was but looking through the forum someone mentioned it was related to 10Gbps Ethernet connection. However, my internet connection has not reduced and right now I am still using all my ports.

The other ports are being used by USB C hard drives.

@itsage

I am confused.

Is this build now running or not?

If it is not running, why is it already listed in the builds?

Cheers

@hans-st, it is running. I am using it right now. I think @itsage was saying I should have used modified apple_set_os v0.5

@maijo_jacob, 

Thank you for clarifying.

Cheers

@Maijo Jacob I can't thank you enough. All I had to do was disable port 1901! Everything works perfectly now! 

@skatendo, Happy to help   

Hello!

Since this is a Mac mini thread i thought I might ask a question here about a similar set tup 

I'm on a Mac mini 2018 with Bootcamp Windows 1903 installed and a RX580 Inside the razer core x as well. I'm running apple_set_os.efi to get my egpu running and it works, but the hdmi port from egpu display a desktop that is behaving like a second screen. I can slide some Windows to it but all the apps pops out on the "main screen" which is the mac mini hdmi port. Any idea how i could get the same image displayed on both ports, or just setting the rx580 as the main display. 
Thank you

Are you using modified apple_set_os v0.5 or not? Are you just doing everything above to get your eGPU to work while plugged into your mini and able to display booting to Mac or Boot Camp without unplugging anything?

I am using modiefied apple_set_os v5 i believe yes. And for the second question also yes i boot with apple_set_os then plug the egpu to thunderbolt 3 beside the ethernet port. It gets detected and then boot into Windows fans fire up in the process then stop arriving on the desktop, no error 12.

But When I plug the hdmi to the egpu, I get a "copy" of my desktop in wich i can slide windows in, but when I launch a game it is still displayed on the mac mini port. I have set the game on high perfomance in the graphics settings, and there I can see high performance card is RX580 so… I don't know.

@luca_hahn, I think this is more to do with Windows rather than the GPU. Does your display setting say RX 580 is you primary display?

@luca_hahn, Not sure why you are using both. The most reliable Boot Camp procedure for me is the modified apple_set_os v0.5 alongside Windows 10 1903 V1 ISO. It has worked for several months now at every boot. I disabled automatic update in Windows 10 to keep the build version at 18362.295. The 2018 Mac mini has gone through many macOS system updates but no interferences with Boot Camp.

Posted by: @itsage

@luca_hahn, Not sure why you are using both. The most reliable Boot Camp procedure for me is the modified apple_set_os v0.5 alongside Windows 10 1903 V1 ISO. It has worked for several months now at every boot. I disabled automatic update in Windows 10 to keep the build version at 18362.295. The 2018 Mac mini has gone through many macOS system updates but no interferences with Boot Camp.

 

Agreed, I got it work now with v0.5 apple set OS. I'm plugged in directly to my eGPU via HDMI from my monitor and of course the Thunderbolt 3 port is plugged into my Mac Mini thunderbolt (next to ethernet).

However, how can I only use my eGPU to boot from either MAC or BOOT CAMP? It looks like holding alt doesn't bring up the MAC or WINDOWS selection. Anyone have a solution to this?

@urzh, Use Startup Disk in macOS and Boot Camp Utility in Windows to switch back and forth.

@itsage, thanks

Btw, your site is great, thanks for helping others on it. The amazon affiliate plugin you use that searches for products and links them in all posts must work well for you...i run many sites and first time ive seen something like this

@urzh, That is @nando4‘s excellent work! 

@itsage I think I got confused I'm only using modified apple_set_os.efi, I found on a build from @sdedalus1 then I installed the original drivers from Amd to great result as well to counter act error 12. And @maijo_jacob I thought so too, in the Advanced display settings I still have Intel UHD 630 as primary display but I see no option to change it. 

@luca_hahn, I am saying why don't you select the monitor that is your RX580 and select that as your main display.

@maijo_jacob If you are talking about the display settings Under the system setting in Windows*. Under multiple display, it says no other monitor detected. Do you think pluggin 2 monitors at the same time would do the trick of accessing the setting?

*French version of windows

@luca_hahn, yes, I think that might trick the system to use RX580 as the main display. Another option is to disable internal graphics card from the device manager. If I look in my Device Manager, I don't have the internal graphics card meaning the UHD Graphics 630 iGPU is not listed as a display adapter.

Ignore my "Citrix Indirect Display Adapter", that is just a software for connecting via Citrix application.

@maijo_jacob oh yes! Might be a good idea too. I'm gonna try both.
Thanks man 

@maijo_jacob all right man it worked! By Simply sliding the display settings to the "Egpu screen". Windows was able to detect the "second monitor" and gave me the option to make it the main display. It was kind of hard fishing for that window without a second screen, but it's "doable". Excuse my french!
Anyway thanks for the leads that was really helpfull. Cheers!

Ps: If the Community deems usefull that I make a thread of my set up too, I will gladly do it, except for that little problem of main display it's mainly inspired by @sdedalus1's build.

@luca_hahn, Awesome. I am glad it worked out.