OS X 10.14.6 Security Update December 10th, 2019 - EGPU is no longer working
I read that you already did that. But here I found thread that the resetting of NVRAM did work. Here is the link how they manage it. https://discussions.apple.com/thread/250934910
Please try it and let us know if it works for you.
Thank you, I can report that this worked! Many thanks.
Was not able to rollback. Problem persists. Did this update firmware?
The security update updated the mini firmware the NVRAM reset only works once then it goes back
This is known to apple and logger in the developer community until then workarounds only
This is the solution that so far has made me boot a couple of times without problems
Issue occurs if you boot with filevault on or if you did a system update with the eGPU connected or in recovery mode
To restore normal function:
1. Shutdown the system
2. Turn off the eGPU
3. Retrieve an HDMI cable and connect the mini to the display with this cable
4. Boot and reset the NVRAM with command+option+P+R
5. Complete login
6. Disconnect HDMI cable
7. Turn on the eGPU
The reboot will not show anymore the apple and will only give some purple lines just before the login screen
Thank you. I don't use FileVault. I am hoping for a fix from Apple, this worked only once in my setup.
I had the same problem and NVRAM reset was not working for me. I solved it by using rEFInd and a modified apple_set_os.efi to boot into Windows, then disabling resources in Device Manager to get rid of error 12. See my build for a guide: https://egpu.io/forums/builds/2018-mac-mini-rx-580-16gbps-tb2-akitio-thunder2-macos-10-14-6-win10-1903-external-ssd-sdedalus1/
It might be simpler to use a USB-C to HDMI converter: boot to Windows with display directly connected via HDMI converter, then hot-plug eGPU. But I have not tried this method to confirm it works.
It seems todays security update (Security Update 2020-001 Mojave) has fixed my problem.
We will see if that holds?
So far, restart and cold starts work after three tries.
I'm having issues along these lines too...
Last week I updated from macOS Mojave 10.14.5 to 10.14.6 - all went well, once I'd uninstall and reinstalled the purge-wrangler patches.
Yesterday, I applied Security Update 10.14.6 2020-001 - and it is now very unhappy. Primarily the problem seems to be that having the eGPU plugged in stops the Mac Pro booting - I don't even get the startup chime until I unplug the eGPU, power down the Mac and power up again.
I've tried uninstalling and reinstalled the purge-wrangler (6.2.2) patches.
I've tried re-installing macOS 10.14.6 over the top of the current installation, and then not applying the Security Update.
So far, these haven't helped.
However, I've tried attaching it to another identical Mac Pro - and here it's working fine, even when I apply the same 10.14.6 update and Security Update 2020-001. I've compared the firmware of the two Macs, and they're the same. Huh...
Any ideas how I might be able to resolve this? Unfortunately, due to my desk setup and wanting to keep the noise of the eGFX Box away, it's all tucked away behind other stuff - so plugging in once the Mac has started up isn't going to be a viable option.
Any suggestions - or useful diagnostics I can do - very welcome!